# physics

In a particular crash test, an automobile of
mass 1369 kg collides with a wall and bounces
back oﬀ the wall. The x components of the initial and ﬁnal speeds of the automobile are
10 m/s and 1.9 m/s, respectively.
If the collision lasts for 0.18 s, ﬁnd the
magnitude of the impulse due to the collision.
Answer in units of kg · m/s

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1. Divide the momentum change by the tuime interval of contact. (Take care to reverse the sign when the velocity direction reverses)

M*(delta V)/t = 1369*[10-(-1.9)]/0.18
= 9.05*10^4 kg m/s

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posted by drwls

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