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  1. E

    physics help, normal force, how much work is done,energy change?

    A cart loaded with bricks has a total mass of 17.7 kg and is pulled at constant speed by a rope. The rope is inclined at 28.5 ◦ above the horizontal and the cart moves 21.7 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0.7 . The acceleration of gravity...
  2. E

    physics help,Find the speed of the block?

    A 4.69 kg block initially at rest is pulled to the right along a horizontal surface by a constant, horizontal force of 18 N. The coefficient of kinetic friction is 0.15. The acceleration of gravity is 9.8 m/s2 . Find the speed of the block after it has moved 2.59 m. Answer in units of m/s.
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