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11 April, 04:45

A 20.0 kg mass moving at a velocity of + 3.0 m/s is stopped by a constant force of 15.0 n. how many seconds must the force act on the mass to stop it? html editor keyboard shortcuts

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  1. 11 April, 07:32
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    The mass is 20 kg, initial speed is 30 m/s and the final speed is 0 m/s (rest),

    while the force is 15 N

    Using second newton's law of motion which states that the rate of change in momentum is directly proportional to the resultant force. Then

    Ft = MV-MU

    15 t = 20 (0-3)

    15t = - 60

    t = - 4 sec (negative because the force is acting on opposite direction to the motion)

    Therefore, the time taken is 4 seconds
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