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Q.

A truck that is initially at rest travels 90 m in 9 seconds and continues in this manner. If the body moves with uniform acceleration, what is its acceleration?

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a

0 m/s2

b

8 m/s2

c

1.99 m/s2

d

5 m/s2

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Given s = 90 m, t = 9 sec, u = 0 m/s

The following is the equation of motion that connects displacement, initial velocity, and time:s = ut + ½ at2

When the given values are substituted, the above equation becomes

90=0×9+12a×92

90=9+40.6a

a = 1.99 m/s2


 

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