Physics!!?
A dry cleaner throws a 20 kg bag of laundry
onto a stationary 8.2 kg cart. The cart and
laundry bag begin moving at 2.4 m/s to the
right.
Find the velocity of the laundry bag before
the collision.
Answer in units of m/s.
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Answers & Comments
momentum M conservation :
Vb = (mb+mc)*V/mb = 2.4*(20+8.2)/20 = 3.384 m/sec
Momentum is conserved.
after the collision the momentum is (20+8.2) * 2.4
before the collision the momentum was 20 * v
equate the two.
20v = ( 20+8.2) * 2.4
and solve for v
= 2.4 * 28.2/20 ~= 3.4 m/s