Question

1.
A body moves with a speed of 10 ms- due East. After 10 minutes, it moves with a speed of
5 ms-' due West. The change in the velocity of the body during this time interval is [
a) 15 ms due East b) 5 ms- due East c) 5 ms-1 due West d) 15 ms due West​

Answer 1

Answer:

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.