- 搜标题
- 搜题干
- 搜选项
单项选择题
A 57-g tennis ball is traveling straight at a player at 21 m/s. The player volleys the ball straight back at 25 m/s. If the ball remains in contact with the racket for 0.060 s, what average force acts on the ball?
A． 22.6 N
B．32.5 N
C．43.7 N
D．72.1 N
E．102 N
B．32.5 N
C．43.7 N
D．72.1 N
E．102 N
