Question

A ball is thrown upward and reaches at height of 64m its intial velocity should

Answer 1

Let initial velocity is Vo
Final velocity is V = 0
Height is d = 64m
Acceleration g = 9.8 m/s^2

Using,

${V}^{2} = {Vo}^{2} + 2ad$

${0}^{2} = {Vo}^{2} + 2( - 9.8)(64)$

${Vo}^{2} = 2(9.8)(64)$

${Vo}^{2} = 1254.4$

$Vo = 35.42 \: \frac{m}{s}$