Physics for Life science

posted by .

You are on a skateboard of mass 5.00kg with a ball in hands (mass of the ball is 600kg). You throw the ball forward horizontally and find that you recoil back with 2.0m/s. What is the forward speed of the ball? (Use your own mass where needed).

  • Physics for Life science -

    Assume there is no friction and use conservation of total momentum.
    M1 = skateboard mass
    M2 = your mass
    M3 = ball's mass
    Vr = recoil velocity
    Vb = ball velocity
    (M1 + M2) Vr + M3 Vb = 0
    Vr = -[M3/(M1 + M2)]*Vb
    Plug in your numbers. Vr is negative because the recoil is in the opposite direction

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A bowling ball encounters a 0.76m vertical rise on the way back to the ball rack. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. If the translational speed of the ball is 3.80m/s at the bottom …
  2. physics

    In preparation for shooting a ball in a pinball machine,a spring (K=675N/m) is compressed by 0.0690m relative to its unstrained length. The ball(m=0.600kg) is at rest against the spring at point A.When the spring is released, the ball …
  3. physics

    A girl of mass 60 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 11 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. What is the average …
  4. physics

    at a ball game consider a baseball of mass m=0.15 that falls directly downward at a speed v=40m/s into the hands of a fan. what impulseft must be supplied to bring the ball to rest?
  5. Physics

    A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with the same speed. The ball is in contact with the wall 0.05 s. What is the average …
  6. Physics

    Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is …
  7. physics

    Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is …
  8. physics

    Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is …
  9. urgent physics..

    Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is …
  10. Physics

    At the 2014 ALCS game 2, the Royals started their right-handed pitcher Wade Davis whose fastball typically reaches 94 mph. if his throwing motion covers 2.8m from the position where his arm starts to make forward motion to release …

More Similar Questions