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# 4 - Physics problems: I really need help with this!?

I always think I know the answer but it never excepts my inputs- I am almost in tears over this homework.1)A truck stops in a distance Dm 254.84 mThe initial velocity is v0 50 m/s and total mass is m 3137.8 kgThe coefficient of friction is mk 0.5 What would the stopping distance have been it a truck had twice the mass as the first? 2) A car with a mass of 500 kg, starting from rest, 402 m drag race in 4.3 sThe final speed is 115 m/sWhat is the engine's average power output?3)A 0.156-kg baseball is thrown, and approaches a bat at a speed of 58.1 m/sThe bat does Wnc 71.6 J of work on the ball in hitting itIgnoring the air resistance, determine the speed of the ball after the ball leaves the bat and is 29.2 m above the point of impact4)A piano with a mass of 191 kg is lifted at a steady speed 14.8m above the groundThe crane that is doing the lifting produces a steady power of 435WHow much time does ii take to lift the piano?