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(a) A bullet with a mass of 2.10 g moves at a speed of 1.50 x 10³ m/s. If a tennis ball of mass 57.5 g has the same momentum as the bullet, what is its speed (in m/s)? m/s (b) Which has greater kinetic energy, the ball or the bullet? O Both have the same kinetic energy. The bullet has greater kinetic energy. O The ball has greater kinetic energy.
A 7.80-g bullet moving at 540 m/s penetrates a tree trunk to a depth of 6.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (Enter the magnitude.) N (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. S
A professional golfer swings a golf club, striking a golf ball that has a mass of 55.0 g. The club is in contact with the ball for only 0.00480 s. After the collision, the ball leaves the club at a speed of 39.0 m/s. What is the magnitude of the average force (in N) exerted on the ball by the club? N