Question

A body moving in a straight line at 72 kmph undergoes an acceleration of 4m/s2. find its speed after 2 seconds.

Answer 1

The speed after 2 seconds is 0.02 km/s

Explanation:

From the question, the speed given is 72 kmph.

Now, the body is moving 72 kilometres in one hour.

1 hour = 60 minutes = 3600 seconds

Thus, the body is moving 72 kilometres in 3600 seconds.

3600 seconds = 72 kilometres

1 seconds = 72/3600 kilometres = 0.02 kilometres

Now, the body is moving 0.02 kilometres in 1 second.

(2 × 1) seconds = 2 seconds = (2 × 0.02) kilometres = 0.04 kilometres

Now, the speed = Distance ÷ Time

Speed at 2 seconds = 0.04 ÷ 2 = 0.02 km/s

Answer 2

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