Body 1 exerts a force on body 2

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Body 1 exerts a force

\vec F_{12}=3a\,\hat i+4a\,\hat j\,\text{N}

on body 2. The reaction force

\vec F_{21}

has magnitude

20\,\text{N}

. Determine the value of

a

. (a)

3

(b)

5

(c)

4

(d)

2

Related theory

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