A car initially travelling at 25.90 ms undergoes a constant, Ask an Expert

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Q. A car initially travelling at 25.90 m/s undergoes a constant negative acceleration of magnitude 1.60 m/s2 after it brakes are applied. How many revolutions does each tire make before the car comes to a stop, assume the car does not skid and the tires have radii of 0.33m?

Q. A pendulum is made by tying a 490 g ball to a 52.0 cm-long string. The pendulum is pulled 21.0^circ to one side, then released. What is the ball's speed at the lowest point of its trajectory?

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