1. Two identical blocks are connected to the opposite ends of a compressed sprin
ID: 2040150 • Letter: 1
Question
1. Two identical blocks are connected to the opposite ends of a compressed spring. The blocks initially slide together on a fricitonless surface with velocity v to the right. The spring is then released by remote control. At some later instant, the left block is moving at v/2 to the left, and the other block is moving to the right. What is the speed of the center of mass of the system at that instant?
a) v/2
b) 5v/2
c) 3v/2
d) v
2. Two friends sit on a stationary boat on a frictionless lake. One friend tosses a heavy ball to the other, who catches it. After the ball is caught, which way does the boat move?
a) In the same direction as the ball was moving
b) In the opposite direction the ball was moving
c) It doesn't move at all
d) This depends on the mass of the ball.
Explanation / Answer
answer for 1
option d is correct. no change in spped of the block.
answer for 2
option b. in the opposite direction the ball is moving
from newtons third law
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