# physics

posted by .

A wagon with a width of 2.4 m, moving at a speed of 15 m per second, was shot through by a bullet
perpendicular to the movement of the wagon. The distance between the two bullet holes in the
wagonâ€™s walls is 6 cm. What is the speed of the bullet?

• analysis of crime scene -

How long does it take the wagon to move .06 meters?
.06 = 15 t
t = .004 seconds
So
the bullet moved 2.4 meters in .004 seconds
v = 2.4/.006 = 400 m/s

• sorry, typo -

2.4/.004 = 600 m/s

• physics -

The bullet moved 2.4 meters in the same time the cart moved .06 meters
so
bullet spped = wagon speed *(2.4/.06)
= 15 * 2.4/.06
= 600 m/s

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