A woman pulls a crate up a rough inclined plane al constant speed. Which stateme

Question

A woman pulls a crate up a rough inclined plane al constant speed. Which statement concerning this situation is not true? a. The woman does positive work in pulling the crate up the incline. b. The work done on the object by gravity is zero. c. The net work done by all the forces acting on the crate is zero. d. The work done on the crate by the normal force due to the plane is zero. e. The gravitational potential energy of the crate is increasing. You are commissioned to design a large water slide such that people coming down the slide shoot out horizontally at the bottom, which is a distance of 3.2 m above the water in the swimming pool. A person starting down the slide from rest should not exceed a safe speed of 7.0 m/s at the bottom of the slide. What maximum value would you choose for the height h of the slide? Neglect friction and air resistance. a. 9.8 m. b. 2.0 m c. 5.7 m. d. 13.2 m. e. 7.3 m.

Explanation / Answer

2. (b) the work done by the gravity on object is zero.(incorrect statement)

As the gravitational force is acting downward and the object is moving upward., So, work done by the gravity is Negetive.

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