7.13 | A car’s bumper is designed to withstand a 4.0-km/h (1.1-m/s) collision with an immovable
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7.14 | Boxing gloves are padded to lessen the force of a blow. (a) Calculate the force exerted by a
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7.15 | Using energy considerations, calculate the average force a 60.0-kg sprinter exerts backward
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7.25 | How high a hill can a car coast up (engine disengaged) if work done by friction is negligible
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7.24 | A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m-high rise as shown in
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7.8 | Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a
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7.12 | Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a
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8.45 | Two identical pucks collide on an air hockey table. One puck was originally at rest. (a) If
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7.4 | Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30% of
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