Question

范

大一普物
不知道怎麼計算
求解🙏

30. Review. A 7.80-9 bullet moving at 575 m/s strikes the hand
of a superhero, causing the hand to move 5.50 cm in the
direction of the bullet's velocity before stopping. (a) Use
work and energy considerations to find the average force
that stops the bullet. (b) Assuming the force is constant, de-
termine how much time elapses between the moment the
bullet strikes the hand and the moment it stops moving.