Question

Question #ee3f1

Answer 1

The potential energy is `=150J`

Explanation:

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`