The displacement of a body at any time t after starting is given by s = 10t-1/2(0.2)t² . After how much time the velocity of the body becomes zero.
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Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s.
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