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Answer 1 · 2018-01-28T06:55:28

The potential energy is $=150J$

To calculate the potential energy, calculate the height after $2s$

Apply the equation of motion

Resolving in the direction $uarr^+$

$h=ut-1/2g t^2$

The initial velocity is $u=15ms^-1$

The acceleration due to gravity is $g=10ms^-2$

The time is $t=2s$

The height is

$h=15*2-1/2*10*2^2=30-20=10m$

The mass is $m=1.5kg$

The potential energy is

$PE=mgh=1.5*10*10=150J$