A 3.0 kg block is pushed 2.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 28.0. with the horizontal, as shown in the figure. The acceleration of gravity is 9.81 m/s^2. If the coefficient of kinetic friction between

the block and the wall is 0.40, find

a) the work is done by the force on the block.

Answer in units of J.

b) the work done by gravity on the block.

b) the work done by gravity on the block.

In what direction does the medium move relative to the direction of the wave? explain.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.

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