1) A 75 kg bobsled is pushed along a horizontal surface by two athletes. After t

Question

1) A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled is pushed a distance of 4.5 m starting from rest, its speed is 6.0 m/s. Find the magnitude of the net force on the bobsled.

2) A 2000 kg car accelerates from rest under the actions of two forces. One is a forward force of 1140 N provided by traction between the wheels and the road. The other is a 950 N resistive force due to various frictional forces. Use the work-kinetic energy theorem to determine how far the car must travel for its speed to reach 2.0 m/s.

3) A roller coaster car is moving at 20 m/s along a straight horizontal track. What will its speed be after climbing the 15-m hill shown in the figure if friction is ignored?

Thank you! You don't have to give me the answer, just please show me the steps.

Explanation / Answer

2) The mass of car, m = 2000 kg The initial velocity of the car. u = 0 The final speed, v = 2 m/s The net force acts on the car, F = 1140 - 950 = 190 N F = ma a = F/m = 190/2000 = 0.095 m/s^2 v^2 - u^2 = 2as From the above, s = (v^2 - u^2)/2a = 21.05 m So the distance traveled by the car, s = 21.05 m PLEASE GIVE EACH PROBLEM AS SEPARATE POST. THANq

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