A parachutist is in free fall at a rate of 200 km/h when he opens his parachute at an altitude of 600 m. Following a rapid and constant deceleration, he then descends at a constant rate of 50 km/h from 586 m to 30 m, where he maneuvers the parachute into the wind to further slow his descent. Knowing that the parachutist lands with a negligible downward velocity, determine (a) the time required for the parachutist to land after opening his parachute, (b) the initial deceleration.

Q: PROBLEM 13.139 50 mm A baseball player catching a ball can soften the impact by pulling his hand…

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Q: A girl throws a ball at an inclined wall from a height of 3 ft, hitting the wall at A with a…

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Q: A toy rocket of mass 1 kg is placed on a frictionless horizontal surface at rest. Then the rocket…

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Q: In an elevator shaft, a ball is thrown vertically upward with an initial velocity of 18 m/s from a…

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Q: A toy rocket of mass 1 kg is placed on a frictionless horizontal surface at rest. Then the rocket…

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Q: Packages are thrown down an incline at A with a velocity of 1 m/s. The packages slide along the…

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Q: Car B is towing car A at a constant speed of 10 m/s on an uphill grade when the brakes of car A are…

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Q: A 4kg ball and 3kg ball move on a smooth plane along a straight path with speeds equivalent to 6m/s…

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Q: A train is moving with uniform speed along a level road. A man on the observation platform drops a…

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Q: The coefficient of restitution of a ball against concrete is 0.5.  If the ball is thrown…

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Q: Two swimmers A and B, of weight 190 lb and 125 lb, respectively, are at diagonally opposite corners…

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Q: Two cars of the same mass run head-on into each other at C. After the collision, the cars skid with…

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Q: Two blocks A and b , of mass 4 kg and 5 kg, respectively, are connected by a cord that passes over…

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Q: At an amusement park there are 200-kg bumper cars A, B, and C that have riders with masses of 45 kg,…

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Q: The 5.7-kg box has a velocity of 9 m/s at A. It slides on a rough surface from A to B (L=2.16 m,…

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Q: A hockey player hits a puck and slides 60 ft for 5 s with a velocity of 4 ft/s on the ice. Determine…

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Q: A ball is thrown vertically upward the ground with an initial velocity of 128 ft/s . (a) Determine…

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Q: A baseball player catching a ball can soften the impact by pulling his hand back. Assuming that a…

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A: Apply the law of conservation momentum for first case as v1 = 0,                 (46.5kg + 5.25kg)…

Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.