if a person with a mass of 70kg is standing on scale in an elevator when the cable snaps, what will the reading on the scale be
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By the work energy theorem, the total work done on the stone is given by its change in kinetic energy,
We have
Then the total work is
The free fall of the phone is an uniformly accelerated motion toward the ground, with constant acceleration equal to
So, assuming the downward direction as positive direction of the motion, since the phone starts from rest the distance covered by the phone after a time t is given by
And if we substitute t=2.7 s, we find the distance covered:
So, assuming the downward direction as positive direction of the motion, since the phone starts from rest the distance covered by the phone after a time t is given by
And if we substitute t=2.7 s, we find the distance covered: