Plz help in this question.

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.