A block, mass m = 6 kg, is pulled from rest (v0 = 0) to the right by a constant horizontal force F = 12 N. After it has
been pulled for d = 3 m, find it’s final speed v

25 kg crate is dragged from rest across a horizontal floor by pulling force of 150 N which 28 degrees above the horizontal. The coefficient of kinetic friction is 0.35. What is the work done by the friction force after the crate is pulled for 10m? What is the speed of the crate after the crate is pulled for 10 m?

A mass m = 15 kg is pulled along a horizontal floor, with a coefficient of kinetic friction , for a distance d = 6.9 m. Then the mass is continued to be pulled up a frictionless incline that makes an angle with the horizontal. The entire time the massless rope used to pull the block is pulled parallel to the incline at an angle of (thus on the incline it is parallel to the surface) and has a tension T = 33 N

1)What is the work done by tension before the block gets to the incline?

2)What is the work done by friction as the block slides on the flat horizontal surface?

3)What is the speed of the block right before it begins to travel up the incline?

4)How far up the incline does the block travel before coming to rest?

A block rests on a horizontal, frictionless surface. A string isattached to the block, and is pulled with a force of 45.0 N at anangle ? above the horizontal, as shown in the figure. After theblock is pulled through a distance of 1.50 m its speed is v = 2.20m/s, and 45.0 J of work has been done on it.

(a) What is the angle ??

(b) What is the mass of the block?