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Force and Laws of Motion
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01/11/2021 7:33 pm
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How long will it take a force of 10 N to stop a mass of 2.5 kg which is moving at 20 m/s?
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01/11/2021 7:38 pm
Mass of the body = 2.5 kg
Initial velocity u = 20 m/s
Final velocity v = 0 m/s
Force F = 10 N
Acceleration a = \(\frac{F}{m}\) = \(\frac{10}{2.5}\) = 4 m/s2
Since v < u, so acceleration will have a negative sign a = -4 m/s2
Time t = \(\frac{v - u}{a}\) = \(\frac{0 - 20}{-4}\) = 5s