Question #ee3f1

1 Answer
Jan 28, 2018

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