Question

A 50g arrow moving at 20m/s strikes a pumpkin and drills a 35cm hole straight through it. When it emerges, the arrow has a speed of 8m/s. Assume uniform deceleration, find the time taken by the arrow to pass through the pumpkin.

Answer 1

The time taken by the arrow to pass through the pumpkin

$$t=\frac{2d}{v_i+v_f}\\ =\frac{2*0.35}{20+8}=0.025\:\rm s$$