Solving Momentum & Conservation of Energy for Elastic Collision

[pat666]

Homework Statement

1. A blue puck with a mass of 0.0400 kg, sliding with a velocity of magnitude 0.200 ms-1 on a frictionless horizontal table, makes a perfectly elastic, head-on collision with a red puck with mass, m, initially at rest. After the collision, the velocity of the blue puck is 0.050 ms¯¹ in the same direction as its initial velocity.
Find: a) the velocity (magnitude and direction) of the red puck after the collision
and b) the mass, m, of the red puck.

Homework Equations

The Attempt at a Solution

Ok so can someone please do this, i have and i got v=0.25m/s and m=0.024kg

I know that this is meant to help and not give answers but i did it myself and just need some confirmation on the answer.

 

[ehild]

The result is correct.

ehild

 

[pat666]

Thankyou