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Question: A vehicle moves west with a speed of 50 ms<sup>-1</sup> and then towards north with a speed of 50 ms...

A vehicle moves west with a speed of 50 ms-1 and then towards north with a speed of 50 ms-1 only. Total time taken by the body is 5s. What is the average acceleration of the body?

A

0

B

50ms-2

C

14ms-2

D

20.4 ms-2

Answer

14ms-2

Explanation

Solution

Change in velocity

= 502+502=5000=70.7ms1\sqrt{50^{2} + 50^{2}} = \sqrt{5000} = 70.7ms^{- 1}

∴ acceleration = change in velocity/time

= 70.7/5 = 14.14 ms-2.