Question

You are standing on a slippery sheet of ice that covers a parking lot. A friend throws you a 0.600‐kg ball that is traveling horizontally at 10.0 m/s. Your mass is 70.0 kg. a) If you catch the ball, with what speed will you and the ball move afterward? b) If the ball hits you and bounces off of your chest, so afterward it is moving horizontally at 8.0 m/s in the opposite direction, what is your speed after the collision?

Answer 1

(a). The final speed
`V_(2)` = 0.085
`(m)/(s)`

(b). The speed after collision
`V_(2)` = 0.15
`(m)/(s)`

Step-by-step explanation:

`m_(1)` = 0.6 kg

`V_(1)` = 10
`(m)/(s)`

`m_(2)` = 70 + 0.6 = 70.6 kg

(a). From conservation of momentum principal

`m_(1)`
`V_(1)` =
`m_(2)`
`V_(2)`

0.6 × 10 = 70.6 ×
`V_(2)`

`V_(2)` = 0.085
`(m)/(s)`

This is the final speed.

(b). From conservation of momentum principal

0.6 × 10 = 0.6 × (-8) + 70
`V_(2)`

70
`V_(2)` = 6 + 4.8

`V_(2)` = 0.15
`(m)/(s)`

This is the speed after collision.