Question

How high should a 2 kg mass be lifted from the ground if it is thrown upward at speed of 15 m/s? ( Assume g=10 m/s²)

Answer 1

Given:

$m=2\:\rm kg$

$v_0=15\:\rm m/s$

The maximum height that mass reaches

$$h_{\max}=\frac{v_0^2}{2g}=\rm \frac{(15\: m/s)^2}{2*10\: m/s^2}=11.25\: m$$