Question

A bullet traveling horizontally at a speed of 350 m/s hits a board perpendicular to the surface, passes through it, and emerges on the other side at a speed of 210 m/s. If the board is 4.00 cm thick, how long does the bullet take to pass through it? (Assume a constant deceleration as the bullet passes through the board.)

Answer 1

0.14 ms

Step-by-step explanation:

Given:

Δx = 0.0400 m

v₀ = 350 m/s

v = 210 m/s

Find: t

Δx = ½ (v + v₀) t

0.0400 m = ½ (210 m/s + 350 m/s) t

t = 0.00014 s

t = 0.14 ms