Question

You stand on a cliff 30. m high. You throw a rock off the cliff straight up at 10. m/s. Calculate the time of flight and the final velocity of the rock as it strikes the ground at the bottom of the cliff.

Answer 1

First you have to calculate rising time (t) ,
Then you calculate, how high stone rises (y).
Then stone is in free wall.

if V0 = 10 m/s, then in highest point v = 0
you can start with v = V0 - gt, solve time
then y = V0t - 0,5gt^2, y is height from the top of cliff.