A 2.8-kg tool can move on a perfectly smooth ramp that slants at ...

[wenmo]

A 2.8-kg tool can move on a perfectly smooth ramp that slants at 42 above the horizontal. What are the magnitude and direction of the acceleration of this tool if it is sliding (a) up the ram, (b) down the ramp?
 
  What will be an ideal response?

Question 2

A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground, and it rebounds with an upward speed of 1.00 m/s. The ball is in contact with the ground for 0.0140 s.
 
  What is the average force exerted by the ground on the ball during the time of contact? A) 2.00 N upwards
  B) 2.00 N downwards
  C) 22.0 N upwards
  D) 22.0 N downwards
  E) 0.00 N

[ErinKing]

Answer to Question 1

(a) 6.6 m/s2 down the ramp (b) 6.6 m/s2 down the ramp

Answer to Question 2

C