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a ball is dropped from a height of 15 m and bounces back with same speed. it was in contact with ground for 10 millisecond and change in momentum is -7.5m/s. find the mass
Since u have asked twice i writing here again, change in momentum is -7.5m/s.Therfore the impulse that is J = -7.5J = -Fdt7.5 = F * 10 * 10^-3F = 750 N.that is Normal force actually exerted at the timme of contact.Gence at that time,N = mg (as simple)10m = 750 m = 75 kg.
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