3 Fig. 3 shows two people, Sam and Tom, pushing a car of mass 1000 kg along a straight line \(l\) on level ground.
Sam pushes with a constant horizontal force of 300 N at an angle of \(30 ^ { \circ }\) to the line \(l\).
Tom pushes with a constant horizontal force of 175 N at an angle of \(15 ^ { \circ }\) to the line \(l\).
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\caption{Fig. 3}
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- The car starts at rest and moves with constant acceleration. After 6 seconds it has travelled 7.2 m .
Find its acceleration.
- Find the resistance force acting on the car along the line \(l\).
- The resultant of the forces exerted by Sam and Tom is not in the direction of the car's acceleration. Explain briefly why.