In a perfectly elastic collision, a 400-g ball moving toward the ...

[jman1234]

In a perfectly elastic collision, a 400-g ball moving toward the east at 3.7 m/s suddenly collides head-on with a 200 g ball sitting at rest. (a) Determine the velocity of the first ball just after the collision.
 
  (b) Determine the velocity of the second ball just after the collision. (c) Is kinetic energy conserved in this collision? How do you know?

Question 2

What is the magnitude of the gravitational force that two small 7.00-kg balls exert on each other when they are 35.0 cm apart? (G = 6.67  10-11 N  m2/kg2)
 
  What will be an ideal response?

[jasonq]

Answer to Question 1

(a) 1.2 m/s toward the east (b) 4.9 m/s toward the east (c) Yes, it is an elastic collision.

Answer to Question 2

2.67  10-8 N

[jman1234]

TYSM

[ktidd]

Excellent