Does anyone do Keystone online learning if so is it hard for u or is it just me I am struggling to finish by my due date.

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

In a system, when potential energy decreases, then entropy also decreases. true false

How do you tell if someone actually cares about you? and just say they do?