| A | B |
|---|
| A 10-kg ball is thrown at 5 m/s due east. What is the ball's momentum? | 50 kg-m/s east |
| What is the momentum of a 1500-kg car traveling at 12 m/s due north? | 18,000 kg-m/s north |
| How fast must a 900-kg car travel in order to have the same momentum as a 1600-kg truck traveling at 30 m/s? | 53.33 m/s |
| A pitcher throws a 200-g baseball with a speed of 12 m/s. The ball is hit into the field with a speed of 18 m/s. If the ball and bat are in contact for 1.5 milliseconds, determine the average force acting on the baseball. | -4,000 N |
| A car with a mass of 1000 kg is sitting at a stoplight. An 1800-kg truck moving at 25 m/s hits the car. If the cars stick together after the collision, determine their mutual speed. | 16.43 m/s |
| A force of 13 N acts upon an object for 2.8 s. What impulse is given to the object? | 36.4 N-s |
| A 6-kg puck has a momentum of 36 kg-m/s. What is the puck's speed? | 6 m/s |
| A 650-g block of wood sits on a frictionless surface. A 10-g is fired into the block at a speed of 325 m/s. If the bullet remains embedded in the block, determine the speed of the combination after the collision. | 4.92 m/s |
| One object is used to hit another object and the change in momentum is 12 kg-m/s. If the objects were in contact for 0.025 s, determine the force exerted by the second object by the first object. | 480 N |
| A 0.75-kg object initially at rest experiences a force of 5 N for 3 s. What is the object's speed after the impulse acts it? | 20 m/s |
| A rifle with a mass of 5 kg fires a 15-g bullet with a speed of 180 m/s. What is the recoil velocity of the rifle? | -0.54 m/s |
| An 850-kg car traveling at 8 m/s collides with a 1400-kg truck moving at 3 m/s in the same direction. During the collision, the car and truck couple and continue to move as one unit. What is the speed of the coupled car and truck? | 4.89 m/s |
| An object moves with some measurable momentum. If the speed of the object was doubled, what would the new momentum be? Explain your answer with a numeric example. | It would have twice the momentum since momentum is directly proportional to the velocity. |
| An object moving at 12 m/s has a momentum of 60 kg-m/s. What is the object's mass? | 5 kg |
| An 850-kg car starts from rest and accelerates at a rate of 2.5 m/s^2. Determine the car's momentum after 6 s. | 12,750 kg-m/s |
| A block of mass 2.5 kg is suspended from a string 1.2 m long. A bullet of mass 30 g is fired into the block of wood, causing it to swing up to a height of 4 cm. What was the initial velocity of the bullet? | 74.67 m/s |
| A 200-g ball moving at 12 m/s collides head-on with a stationary ball of mass 400 g. If the collision is perfectly elastic, what is the speed of each ball immediately after the collision? | v1'=-4 m/s; v2'=8 m/s |
