Mark Scythian, Teacher at Google LLC - YouTube, Numerade Educator

13:43

Physics 101 Mechanics

1. A small, 300 gg cart is moving at
1.60 m/s on a frictionless track when it collides with a
larger, 1.00 kg cart at rest. After the collision,
the small cart recoils at 0.830 m/s .
What is the speed of the large cart after the collision?
Express your answer with the appropriate units.
2. A 3.0 kg block of wood sits on a frictionless
table. A 3.0 gg bullet, fired horizontally at a
speed of 380 m/s , goes completely through the
block, emerging at a speed of 180 m/s .
What is the speed of the block immediately after the bullet
exits?
Express your answer with the appropriate units.
3. A tennis player swings her 1000 gg racket with
a speed of 11 m/s . She hits a
60 gg tennis ball that was approaching her at a speed of
17 m/s . The ball rebounds at 37 m/s .
B. How fast is her racket moving immediately after the impact?
You can ignore the interaction of the racket with her hand for the
brief duration of the collision.
Express your answer in meters per second.
A. If the tennis ball and racket are in contact for
9.0 ms , what is the average force that the racket exerts
on the ball?
Express your answer in newtons.