Question

a 1.2 kg rocket is launched from ground level with initial velocity of 12 m/s. What is the maximum height the rocket can reach?

Answer 1

As the rocket is launched from the ground its height will go on increasing till it stops

So the height of rocket will be maximum when its speed becomes zero

so here we can use energy conservation theory

$PE = KE$

$mgH = \frac{1}{2}mv^2$

$9.8*H = \frac{1}{2}*12^2$

$H = 7.35 m$

So it will reach upto height 7.35 m