A60.0 kg runner is moving at 6.00 m/s and speeds up to 9.00 m/s. the runner’s change in kinetic energy is 1,350 j.

how much work was done?

1,350 J

Explanation:

According to the work-energy theorem, the work done equals the change in kinetic energy.  So W = 1,350 J.

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