Question

A body moving with a velocity of 20m/s, due
east takes a right turn through 60° and
continuous the same speed. What is the change
in its velocity
1. 3 x 20 m/s, 60° of south of west
2. 20 m/s, 60° of south of west
3. 40 m/s, 90° of north of east
4. None of the above
AM​

Answer 1

Explanation:

v

initial

=25

i

^

v

final

=25(

2

1

i

^

−

2

3

j

^

)

∴△

v

=25(−

2

1

i

^

−

2

3

j

^

)

θ=tan

−1

2

−1

2

−

3

⇒θ=60

0

and it is south of west.