- #1

Thickmax

- 31

- 8

- Homework Statement:
- Pre University qualification top up course

- Relevant Equations:
- See below

Please help, I'm really struggling to understand how to work this...

work = mass * gravity * change in height

w = m*g*(h2 - h1)

Total energy = Sum of potential energy + Kinetic Energy

work = 1/2Kinetic Energy * Potential energy ^2

w = (1/2 * K) * U^2

m*g*(h2-h1)=(1/2*k)*U^2

rearanged = (2(m*g*(h2-h1))/U^2)=K

We are given

U, m, g, h2 and h1

Firstly, is my above working along the right line.

Secondly, how to I show this as 80%?

Please help