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Starting from rest, a 2.3x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.31 N on it. This force does 3.2x10-4 J of work on the flea.
(a) What is the flea's speed when it leaves the ground?
(b) How far upward does the flea move while it is pushing off? Ignore both air resistance and the flea's weight.
A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. Illustrate what is the speed of the arrow as it leaves the bow?
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Compute the total distance that the mass has fallen.
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A 76 kg window cleaner uses a 13 kg ladder that is 5.0 m long. He places one end on the ground 3.0 m from a wall, What is the angle of this force on the ladder
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A 1.30-kg ball, moving to the right at a velocity of +4.52 m/s on a frictionless table, collides head-on with a stationary 8.40-kg ball. Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic
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