A stone is thrown upwards from the top of tower 85 m high , reaches the ground in 5 s. find (i) the greatest height it reaches above the ground (ii) the velocity with which it reaches the ground and (iii) the time taken to reach the maximum height . Take g =` 10ms ^(-2)`?

Answer

88. 2 m (ii) ` 42 ms^(-1)` (iii) 0. 8 s