1.

When a body moving along a straight line at20 m/s undergoes as acceleration of 4 m/s2after three seconds its speed will be-(a) 8 m/s(b) 12 m/s(C) 16 m/s(d) 32 m/s

Answer»

Here,v=?u=20a=4t=3

so,a=(v-u)/tor, 4=(v-20)/3or, v-20=12or, v=12+20or, v=32



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