# A 0.450 kg ice puck, moving east with a speed of 3.00 \frac{m}{s} has a head in collision with a 0.900 kg puck, initially at rest. Assuming a perfectly elastic collision what will be the speed and direction of each object after the collision?

A 0.450 kg ice puck, moving east with a speed of $3.00\frac{m}{s}$ has a head in collision with a 0.900 kg puck, initially at rest. Assuming a perfectly elastic collision what will be the speed and direction of each object after the collision?
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curwyrm
The final speeds of the two pucks are given by:
$v=\left[\frac{\left(M-m\right)}{\left(M+m\right)}\right]$
where v is the initial speed of the smaller puck
$V=\left[\frac{2m}{M+m}\right]$
The smaller puck will rebound and travel in the opposite direction of its original velocity at speed:

and the larger puck will continue in the same direction as the original velocity of the small puck: