22. the mechanical efficiency of any machine is always than 100 percent.

23. when a pole vaulter flexes the pole, the pole vaulter increases the pole’s potential energy.

24. wind turbines convert energy into electrical energy.

Freya has a mass of 14kg she is running at 1.1m/s to the left when she runs into eric, who is standing still. eric has a mass of 18kg. after the collision, they continue moving together. what is their velocity after the collision. a. 0.48 m/s to the leftb. 2.5 m/s to the leftc. 0.86 m/s to the leftd. 1.4 m/s to the left