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Answered 2012-03-10 12:46:30

no a body can only have positive velocity .sometimes it have negative acceleration

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when the acceleration of the body is positive its mean that its velocity is increasing and the speed of the motion also increases and speed will decrease when acceleration is negative.

Acceleration is defined as : When velocity of a body gradually increases with time we say that the body is accelerating with respect to time Retardation is defined as : when the rate of velocity of a moving body decreases it is called retardation

Yes it can be.When a body has its initial velocity greater than its final velocity, then the body can have negative acceleration since acc.=change in velocity/time

Negative acceleration means the moving body is slowing down.

firstly, we should know what is meaning of accelerate i.e(to increase)that means acceleration is something which increases some physical quantity.In mechanics,acceleration means rate of change of velocity per unit time .a=v-u/twhere v=final velocity, u=initial velocity ,t=time& a=accelerationnow ,if the change in velocity is positive then i.e final velocity is greater than initial velocity.Suppose to be positive acceleration or simply acceleration.But when change in velocity is negative then acceleration is negative suppose to bedeceleration.Important thing is that acceleration is vector .so ,positive or negative accelerationindicates direction of acceleration.hence , force ,by Newton's second law.acceleration tends to increase the velocity of a moving body in the direction of motion while deceleration tends to decrease the velocity of the moving body applies in opposite direction of motion upto zero velocity after which it accelerate means increase velocity of the body but in opposite direction of initial direction of motion.

Yes. If a body has a constant velocity there is no acceleration, but if the velocity is changing there is acceleration present.

The 'speed' of a body cannot be negative. But if you are stating the 'velocity' then it can be negative. Negative velocity means it is going opposite to the direction that you decided to call the positive direction.

An example in which the acceleration of a body is opposite in direction to its velocity is a car slowing down. This is called negative acceleration, or deceleration.

Yes, a body can have aceleration without velocity. Consider sin x the position; cos x is the velocity and -sin x is the acceleration. Here the acceleration negative when x=90 degrees and the velocity is zero at 90 degrees.

The Physical quantity that the slope of velocity time graph show is:negative acceleration otherwise retardation.If the velocity of the body is decreasing then the body is said to have negative acceleration (-ve) or retardation.u>v

a body is accelerating if it is speeding up faster and faster. Acceleration is the change in velocity. or the change in speed. Slowing down is also acceleration but it is negative acceleration or de acceleration.

The acceleration is zero for a body having constant velocity.

Negative acceleration is the state of a body whose velocity in a specified direction is becoming smaller. If you apply the brakes while driving a car, the car (and you) will undergo negative acceleration in the direction in which the car was moving.

If a body slows down to a stop, it has negative acceleration (deceleration), and when it accelerates negatively to a stop, it will have zero velocity.

there is no acceleration if the body is moving with constant velocity

No; acceleration means the velocity changes.No; acceleration means the velocity changes.No; acceleration means the velocity changes.No; acceleration means the velocity changes.

the question is very a body does not have acceleration when it is moving with constant velocity ,because a body posses acceleration when its velocity is not remain conserved or constant.yes if a body have constant speed it may have acceleration but not in case of constant velocity.

When the body moves with uniform velocity its acceleration is 0. Pls explain.

No. The speed is the length of the velocity vector, and that is always zero or positive.

Acceleration is the CHANGE in velocity; you're assuming CONSTANT velocity. So the acceleration is zero.

Acceleration is zero when the body is moving with a constant velocity. This is one of the newton's laws.

Yes. A body having zero velocity has a constant acceleration of zero.

You are confusing terms.An acceleration is a change in velocity not necessarily an increase in velocity, it is a change.A change in velocity is brought about by a force acting upon a body.

No, momentum can not have a negative velocity. Velocity is the rate of motion of a body from one position to another position in a particular direction. Bodies traveling in opposite directions may appear to have a negative velocity in relationship to each other but any amount of velocity is positive.