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Q. A car accelerates from rest to a kinetic energy of 1.65 x 10^5 Joules in a distance of 646 m. How much force did the car's engine deliver to produce this change in kinetic energy?

Q. Two crewmen pull a boat through a lock, as shown in the figure. One crewman pulls with a force of F1 = 115 N at an angle of θ = 29° relative to the forward direction of the raft. The second crewman, on the opposite side of the lock, pulls at an angle of 45°. With what force F2 should the second crewman pull so that the net force of the two crewmen is in the forward direction?

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