A body moving in a straight line at 72kmph undergoes an acceleration of 4m/s ^{2} . Find its speed after 2 seconds.

Dear student

Answer to first question is as follow:-

Initial velocity, u = 72 kmph = 20 m/s

Acceleration, a = 4 m/s^{2}

Time, t = 2 s

Final velocity, v = ?

We know,

v = u + at

= > v = 20 + 2 X 4

= > v = 28 m/s

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