Solution: A projectile of mass m 1 moving with a speed v1 in the +x direction strikes a stationary target of mass m2 = 2m1 head-on in an elastic collision. Find the final velocity of the projectile m1.
Hint: Y

A projectile of mass m _{1} moving with a speed v_{1} in the +x direction strikes a stationary target of mass m_{2} = 2m_{1} head-on in an elastic collision. Find the final velocity of the projectile m_{1}.

Hint: You can use the energy and momentum principles.

1. -1/3 v_{1}

2. -1/4 v_{1}

3. -1/5 v_{1}

4. 1/3 v_{1}

5. -1/2 v_{1}

6. v_{1}

7. -5 v_{1}

8. 3 v_{1}