Question

A body is provided with an acceleration of 3 m/s^2 for about 2 sec. Find its initial velocity if the final velocity is 10 m/s.

Answer 1

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Here,

a = 3 m/s²

t = 2 s

v = 10 m/s

$a = \frac{v - u}{t} \\ = > 3 = \frac{10 - u}{2} \\ = > 10 - u = 6 \\ u = 4 {ms}^{ - 1}$

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Answer 2

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Given,

Acceleration (a) = 3 m/s^2
Time (t) = 2 sec
Final Velocity (v) = 10 m/s

To find,
Initial velocity (u) = ?

So,

By first equation of motion :-

v = u + at
10 = u + (3) × (2)
10 = u + 6
10 - 6 = u
4 m/s = u
u = 4 m/s

Therefore, the initial velocity (u) of the body is 4 m/s.