A racquetball strikes a wall with a speed of 30 m/s and rebounds ...

[kaid0807]

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?
 
  A) 200 m/s2 B) 1300 m/s2 C) 1500 m/s2 D) 2800 m/s2 E) 0 m/s2

Question 2

A very small 51-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.50 ms. The ball rebounds elastically (at the same speed) and returns to its original height.
 
  The total time interval for a round trip is 3.00 s. What is the magnitude of the average force exerted on the ball by the plate during contact with the plate? A) 3000 N
  B) 1500 N
  C) 2490 N
  D) 2000 N
  E) 3500 N

[macybarnes]

Answer to Question 1

D

Answer to Question 2

A

[kaid0807]

Gracias!

[mammy1697]

TYSM