an arrow travelling at 20m\s strike an antelope and penetrate 6cm.calculate the time it takes to stop

Answer 1

travels 0.06 meters
Vinitial = 20 m/s
Vfinal = 0 m/s
average V = 10 m/s if constant acceleration (force)
time * average V = 0.06 meter
time = 0.06 meter / 10 m/s = 0.006 seconds (not long, tough skin)