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Impulse of a ball being thrown on to the wall

  1. Nov 15, 2015 #1
    1. The problem statement, all variables and given/known data
    a tennis ball of mass m = 0.075kg is thrown at a wall with a speed of v = 15m/s. It strikes the wall at a 45˚ angle and rebounds with the same speed at 45˚. What is the impulse given by the wall?

    2. Relevant equations
    impulse = Change in mass x Change in velocity

    3. The attempt at a solution
    Since the velocity is not changing once the ball rebounds from the wall the impulse is the same as it is when it strikes the wall?
     
  2. jcsd
  3. Nov 15, 2015 #2

    haruspex

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    Velocity is a vector; it has direction. The speed does not change from the bounce, but the velocity does.
    Do you know how to add and subtract vectors?
     
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