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Question: A man is moving oh his bike with 54kmh<sup>-1</sup>. He takes a u-turn in 10s and continues to move ...

A man is moving oh his bike with 54kmh-1. He takes a u-turn in 10s and continues to move with the same velocity. Find average acceleration during this time.

A

3.0 ms-2

B

1.5 ms-2

C

0

D

– 1.5 ms-2

Answer

3.0 ms-2

Explanation

Solution

aav = 15i^(15i^)10\frac { - 15 \hat { \mathrm { i } } - ( 15 \hat { \mathrm { i } } ) } { 10 } = 3 i^\hat { \mathbf { i } } = 3ms-2