A crane lowers a crate of mass M = 150 kg to the ground from an initial height o

Question

A crane lowers a crate of mass M = 150 kg to the ground from an initial height of H = 2.1 m. The crate initially has zero velocity and hits the ground with a velocity of Vf = 2.6 m/s.

What is the work done by the force of tension in the rope in lowering the crate?

Give your answer in Joules to four digits.

A crane lowers a crate of mass M = 150 kg to the ground from an initial height of H = 2.1 m. The crate initially has zero velocity and hits the ground with a velocity of Vf = 2.6 m/s. What is the work done by the force of tension in the rope in lowering the crate?

Explanation / Answer

work done by the tention forces=kinetic energy-gravitational work

=0.5*150*2.6^2-150*9.81*2.1

=-2583.15 J

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