Is it a must that a freely falling body will have initial velocity zero always?
No. If you jerk it downwards, then the body will have the same velocity as your hand. If you are in a free fall and at the middle of it release the body, the body will have an initial velocity equal to your velocity when you released it.
If a ball that is freely falling has attained a velocity of 19.6 meters per second after 2 seconds. What is its velocity five seconds later?
An object that's falling "freely" has no final velocity. The longer it falls, the faster it goes. An object falling through air is not falling "freely", because the friction between it and the air acts as if there were a force acting on it, opposite to the direction in which it's moving. We call that firce "air resistance". The faster the object moves, the stronger the force of air resistance grows. Eventually, it becomes equal…
Acceleration due to gravity is always 9.81 m/s/s, or m/s2 Acceleration is simply the rate of change of velocity, so although acceleration is staying constant, the object is still speeding up as it falls. In this case the velocity of the object increases by 9.81m/s every second. If initial velocity is 10m/s, it will increase to 19.81 m/s in one second, then to 29.62 m/s in the next second, and so on.
What is the relationship between the acceleration velocity and time for a freely falling leaf and a freely falling elephant striking the ground in an evacuated environment?
In an evacuated environment, i.e. in the total absence of air, a leaf and an elephant released from the same height at the same time fall with the same acceleration, acquire the same velocity at any instant during their fall, and end their respective experiences by encountering the ground at precisely the same time.
The average velocity of a falling body from a height is called the law of conservation of energy. which state that in a closed system or lsolated the total amount of energy is always constant although energy can be transform from one form to another i.e P.E=K.E p.E =MgH Where m_mass g_acceleration due to gravity. H_height. K.E=1/2MV^2 WHEre m_mass V_velocity.
No effect whatsoever. Any two freely falling bodies fall with the same acceleration when dropped in the same place on the same planet. That includes any two objects falling on Earth. Someone is sure to jump in here and point out that objects with different mass don't fall with equal accelerations on Earth, and that's because of air resistance. They may even go on to provide answers to other questions that were not asked, such…
What is the velocity acquired by a freely falling object 5 s after being dropped from a rest position?
What is the instantaneous velocity of a freely falling object 7 s after it is released from a position of rest?
Earth is falling.Earth is falling freely around earth but due to inertia it dosent drops on sun it revolves around the sun just like a satellite.When a body falls in the absence of air(air friction)then it is said to be freely falling since there is no air in space therefore Earth is said to be freely falling.
How far will a freely falling object have fallen from a position of rest when its instantaneous speed is 13 meters per second?
Since it is a free-fall motion, this means that acceleration is constant (=g) and therefore, Newton's equations of motion can be used. v2 = u2 + 2as where v is the final velocity u is the initial velocity a is the acceleration and s is the displacement of the body In this case, v = 13 ms-1 , u = 0, a = g ms-2 s = 132/2g m Taking g to be 10, s…
in air, from a plane, force down = m*g, force up = v^2*drag coefficient. drag coefficent can be calculated if teminal velocity is known (where forces are balanced) say terminal velocity = 70 m/s,mass=80kg, g = 9.8 m*g=v^2*dc then: 80*9.8/v^2=dc 0.16=dc increase in mass = increase in terminal velocity to double velocity = four times the mass
Suppose that a freely falling object were somehow equipped with a speedometer By how much would its speed reading increase with each second of fall?
If the object is freely falling near the surface of the earth, then the reading on the speedometer is always 9.8 meters per second (32.2 feet per second) higher than it was one second earlier. That number is called the "acceleration of gravity on earth", and your speedometer is a great way to explain it !
The answer lies in air resistance, which sets a limit, the so-called terminal velocity, on the speed of a falling object. Air resistance creates drag, a real physical phenomenon associated with objects moving through a fluid. You experience drag riding a bike. Imagine how much drag is on a jet airliner! A boat is affected by drag moving through water. Aerodynamics and hydrodynamics address these issues.