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An object at rest cannot start moving with no forces.
yes
Yes. An object cannot begin to move without acceleration, but once it's moving, it needs no further acceleration to continue moving.
23 or 32.
Any uniformly moving observer in an inertial frame, cannot determine his "absolute" state of motion by a co-moving experimental arrangement...Principal of Relativity.
The object is moving at the speed of 50 ms-1 .
An object at rest cannot start moving with no forces.
The velocity = (location at 40 seconds - location at 20 seconds)/20 in the direction in which the object is moving.
yes
No, it can't. Average VELOCITY can be zero, though.
Yes. An object cannot begin to move without acceleration, but once it's moving, it needs no further acceleration to continue moving.
23 or 32.
Any uniformly moving observer in an inertial frame, cannot determine his "absolute" state of motion by a co-moving experimental arrangement...Principal of Relativity.
You haven't given us any information from which to calculate that speed. As far as we know from the question, the object isn't moving at all.
Werner Heisenberg
10 x 30 = 300 metres.
What is the position of the ball at 7.5 seconds