First slide

Scalars and Vectors

Question

What is the angle between a and $- \frac{3}{2} a$ .

Easy

A

$80 °$
B

$90 °$
C

$150 °$
D

$180 °$

Solution

$- \frac{3}{2}$ a has a magnitude equal to $\frac{3}{2}$ times the magnitude of a and its direction is opposite to a. Therefore, a and $- \frac{3}{2}$ a are antiparallel to each other or angle between them is $180 °$ .

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