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Q1- A girl pulls a box of mass m = 6 kg across a floor with a constant horizontal force F = 35 N. Initially the block is at rest. For the first d1 = 7 m, there is no friction between the box and the floor. For the next d2 = 7 m the coefficient of friction between the box and the floor is m = 0.1.

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Circular Motion

Q1- A car moving at a speed of 35 m/s enters a curve that describes a quarter turn of radius 125 m. The driver gently applies the brakes, giving a constant tangential deceleration of magnitude 1.2 m/s2.

a) Just before emerging from the turn, what is the magnitude of the car's acceleration?

b) …

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