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Physics

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A 1.24 kg block is held against a spring of force constant 1.0 104 N/m, compressing it a distance of 0.29 m. How fast is the block moving after it is released and the spring pushes it away?

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    A 1200 kg car is being driven up a 5:0 hill. The frictional force is directed opposite to
    the motion of the car and has a magnitude of f = 524 N. A force ~F is applied to the
    car by the road and propels the car forward. In addition to these two forces, two other
    forces act on the car: its weight ~W and the normal force ~FN directed perpendicular
    to the road surface. The length of the road up the hill is 290 m. What should be the
    magnitude of ~F, so that the net work done by all the forces acting on the car is 150
    kJ?

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