If a body has an initial velocity of -20.00 m/s and it experiences an accelerati

Question

If a body has an initial velocity of -20.00 m/s and it experiences an acceleration of -9.81 m/s squared for 2 s, which of the following statements is true?

The magnitude of the velocity will increase.

B. The direction of motion will be reversed.

C. The displacement will be positive.

D. The body will have a final velocity of 20 m/s.

E. All of the above are true.

The magnitude of the velocity will increase.

B. The direction of motion will be reversed.

C. The displacement will be positive.

D. The body will have a final velocity of 20 m/s.

E. All of the above are true.

Explanation / Answer

We know that v=u+at

Here u=-20m/s and a=-9.81m/s2 and t=2 sec

Putting these values in the above equation we get

v=-20-9.8*2

v=-20-19.6

v=-39.6m/s

So we can see the magnitude of velocity increase. So option (A) is correct.

Since there is no change in direction. So option (B) is incorrect.

Displacement is negative since both veloict and aacleration is negative. So (C) is incorrect.

Final velocity is -39.6m/s. Hence (D) is incorrect.

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