A pebble is thrown vertically upwards with a speed of 20 m s^-2. How high will it be after 2 s ? (Take g = 10 m s^-2)

(a) How long will a stone take to fall to the ground from the top of a building 80 m high and (b) what will be the velocity of the stone on reaching the ground ? (Take g = 10 m s^-2 )

A ball is thrown vertically upwards with an initial velocity of 49 m s^-1. Calculate: (i) the maximum height attained, (ii) the time taken by it before it reaches the ground again. (Take g = 9.8 m s^-2)

A stone is dropped freely from the top of a tower and it reaches the ground in 4 s. Taking g = 10 m s^-2, calculate the height of the tower.