Question #ee3f1

1 Answer
Jan 28, 2018

Answer:

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#