Question

A 7 kg box slides down a long, frictionless incline of angle 28° . It starts from rest at time t = 0 at the top of the incline at a height 27 m above the ground. What is the original potential energy of the box relative to the ground? The acceleration due to gravity is 9.81 m/s 2 . Answer in units of J.

Answer 1

Original potential energy will be 1852.2 J

Step-by-step explanation:

We have given mass of the box m = 7 kg

Height from the ground h = 27 m

Acceleration due to gravity
`g=9.8m/sec^2`

We have to find the original potential energy

We know that potential energy is given by

`PE=mgh=7* 9.8* 27=1852.2J`

So original potential energy will be 1852.2 J