Question

A student launches a 50 g marble vertically with an elastic band. If the marble reaches a height of 10 m, how much elastic potential energy did the student put into the elastic band?

Answer 1

`4.9"J"`

Explanation:

Using the conservation of energy we can say that the elastic energy stored in the band will be converted in gravitational potential energy which we can get from:

`PE="weight"xx"height"`

This becomes:

`PE=mgh`

`:.PE=0.05xx9.8xx10=4.9"J"`

So stored energy = `4.9"J"`