You catch a volleyball (mass 0.270 kg) that is moving downward at 7.50 m/s. In stopping the ball, your hands and the volleyball descend together a distance of 0.150 m.

How much work do your hands do on the volleyball in the process of stopping it?

What is the magnitude of the force (assumed constant) that your hands exert on the volleyball?

Question

Physics

Julie Boyd

27 December, 06:12

You catch a volleyball (mass 0.270 kg) that is moving downward at 7.50 m/s. In stopping the ball, your hands and the volleyball descend together a distance of 0.150 m.

How much work do your hands do on the volleyball in the process of stopping it?

What is the magnitude of the force (assumed constant) that your hands exert on the volleyball?

+1

Answers (1)

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Jaylah Pitts · Answer 1

The work done equals the change in energy.

W = ΔKE

W = 0 - ½mv²

W = - ½ (0.270 kg) (-7.50 m/s) ²

W = - 7.59 J

Work is force times displacement.

W = Fd

-7.59 J = F (-0.150 m)

F = 50.6 N