1.

(c) 1 Erga)ass ókg is under a force which causes2displacement in it given by S=-metres where t is timeThe work done by the force in 2 seconds is(a) 12J42(b) 9J(d) 3J(c) 6J

Answer»

After 2sS = t^2/4S = 1m

v = dS/dtv = 2t/4v = t/2

a = dv/dta = 1/2 m/s^2

F = maF = 6*1/2F = 3N

W = F * SW = 3 * 1W = 3J



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