Question

a body is thrown vertically upward and rises to a height of 15 m. Calculate
1) the initial velocity with which the body was thrown upwards
2) time period to reach ground (g =10m/s^2)
Please solve it fast...

Answer 1

$max. \: height = \frac{ {u}^{2} }{2g} \\ 150 = {u}^{2} \\ so \: u = 12.24mps$
time =2u/g
time=24.5/10=2.45seconds