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## Homework Statement

A 3.0 kg metal ball is held 3.5m above the ground. Find the potential gravitational and kinetic energy of the ball after it is let go and has fallen for 0.4s

## Homework Equations

EK= 1/2mv^2

EP=mgh

## The Attempt at a Solution

Okay I know how to find both the kinetic and potential energy, but how does the time effect it? Is there a certain equation I have to sub it in other than the ones given. Please help :)

Potential= EP=mgh

Ep=(3.0Kg)(9.8m/s^2)(3.5m)

EP= 102.9 J

Kinetic = EK=1/2mv^2

EK=1/2(3.0kg)(9.8m/s^2)

EK=14.7 J