3. Two carts of identical mass are free to move along a straight, frictionless track. At time t, cart X is moving at 2.0 m/s when it collides with and sticks to cart Y, which is initially at rest. Which of
the following graphs best shows the velocity of cart X before and after the collision?
(A)
Velocity (m/s)
Velocity (m/s)
11
Time (s)
Time (s)
(B)
(D)
Velocity (m/s)
Velocity (m/s)
+
0
11
Time (s)
11
Time (s)
-