Question

If the kinetic energy of a 32kg box is 1500 J just before it hits the ground, from what height was it dropped?If the kinetic energy of a 32kg box is 1500 J just before it hits the ground, from what height was it dropped?

Answer 1

Answer:

4.8 m

Explanation:

When it hits the ground, all the kinetic energy is converted to potential energy. Potential energy, PE is given by mgh where m is the mass of the box, g is acceleration due to gravity and h is the height which is unknown for this case

PE=mgh and making h the subject of the formula then $h=\frac {PE}{mg}$ and substituting g with 9.81, PE with 1500 J and m with 32 kg then

$h=\frac {1500}{32\times 9.81}=4.7782874617734m\approx 4.8 m$