Aball is dropped from the top of a building. when does the ball have the most kinetic energy? as it is released just before it hits the ground half way through the fall after it has hit the ground

as it is released just before it hits the ground

Explanation:

By conservation of energy principle  the total energy of a closed system is conserved.

At the release of the ball it has no kinetic energy (K.E). but has maximum potential energy (P.E.)

As ball just before hitting the ground it has no P.P.So alll energy has to converted to K.E. So maximum K.E. will be found as just before it hits the ground.

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

unlike poles attract