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Question

A body moves due East with velocity 20kmhr-1 and then due North with velocity 15kmhr-1. The resultant velocity in kmhr-1


A

5

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B

15

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C

20

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D

25

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Solution

The correct option is D

25


Step 1: Given Data

Initial velocity, u=20 i

Final velocity, v=15j

Step 2: Formula used

Resultant velocity vector=v-u

Step 3: Find the magnitude of the resultant velocity vector

v-u =v2+u2

=152+202

=225+400

=25kmhr-1

Hence, the resultant velocity is 25kmhr-1

Hence, option D is correct.


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