A stone is shot vertically upward with velocity 12m/s at the edge of a cliff having a height of 42 meters.
i) What is the position(y) of the stone at t=1.5s? Is the stone on its way or down at that position?
Justify your answer!
ii) Find the time when the stone is y=5m above the cliff when the stone is on its way down only.
iii) What is the position(y) of the stone when the velocity is v=-28m/s?

Will you chech and finish these for me, because i am stumped with them.

An experiment was performed on a 2-kg block. forces of 5, 10 and 15 newtons respectively were applied to the block for 5 seconds. describe the difference in acceleration between the three trials. a) the final accelerations will all be the same. b) the final acceleration will triple between the first and third trial. c) the final acceleration will be cut by 1/3 from the first to third trial. d) the final acceleration will increase nine time between the first and third trial.

At what point does a moving pendulum have the greatest kinetic energy a) on the left b) on the right c) at the bottom d) at the top hurry