Which one will it be

Are aliens real? justify you’re answer.

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?

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical