Q. 65.0( 1 Vote )

A body moving along a straight line at 20m/s undergoes an acceleration of 4m/s2. After two seconds,  what will its speed will be, exactly after 2seconds?

Answer :

Initial speed, u=20m/s 
Final speed, v =?
Acceleration, a = 4m/s2
And, Time, t = 2s
Now, v = u + at
So, V = 20 + 4 x 2
V = 20 + 8   
V = 28m/s
Thus, after two seconds, the speed will be 28m/s.

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