Question

A ball of mass lkg is at a height of 20m abovc the ground. In free fall, find (i) specd of the ball when it reachcs the ground and (ii) work done by the gravitational forcc. (take g

Answer 1

The net force Fn = m*a = 67*25 = 1675 N

Impulse P = Fn*t = 1675*.010 = 16.75 N∙s

dV = P/m = 16.75/67 = .25 m/s

Answer 2

T'he density ol'a steel ball was deterrnined by mcasr"rling its exerted by the cylinder on the vice, (ii) the work done by of g, the acceleration of free fall at the Earth's surface.

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