Question

A baseball player hits a line drive. Just before the ball is struck, it is moving east at a speed of 40.8 m/s (91 mi/h). Just after contact with the bat, 1.08 10-3 s later, the ball is moving west at a speed of 49 m/s (110 mi/h). Find the ball's average acceleration. magnitude?

An elevator is initially moving upward at a speed of 11.16 m/s. The elevator experiences a constant downward acceleration of magnitude 4.20 m/s2 for 3.06 s.

(a) Find the magnitude and direction of the elevator's final velocity.

(b) How far did it move during the 3.06 s interval? The brakes are applied to a car traveling on a dry, level highway.

A typical value for the magnitude of the car's acceleration is 5.10 m/s2. If the car's initial speed is 28.5 m/s, how long does it take to stop and how far does it travel, starting from the moment the brakes are applied? time to stop? stopping distance?

Answer 1