a. **If Olaf catches the ball**, initially moving at a **speed** of 10.8 m / s, **with what speed vf do Olaf and the ball move afterward**? **Olaf**‘s mass is 70kg **and the ball**‘s mass is 0.4kg. Express your answer numerically in centimeters per second.

**If the ball** hits **Olaf and** bounces off his chest horizontally at 7.70 m/s in **the** opposite direction, **what** is his **speed** v f after **the** collision?

**Olaf** is standing on a sheet of ice that covers **the** football stadium parking lot in Buffalo, New York; there is negligible friction between his feet **and the** ice. A friend throws **Olaf** a **ball** of mass 0.400kg that is traveling horizontally at 11.9m/s . **Olaf**‘s mass is 74.4k

**If the ball** hits **Olaf and** bounces off his chest horizontally at 7.20m/s in **the** opposite direction, **what** is his **speed vf** after **the** collision? from law of conservation of momentum , mu = ( m+ M ) v

from this **speed** of **the Olaf and the ball move** afterwards v = mu / ( m+ M)

= 0.06136 m / s

= 6.136 cm / s