Question

Average speed of a car between points X and Y is 25m/s, between Y and Z is 10m/s. What is the average speed between X and Zif the time taken is 10 seconds and 5 seconds respectively?

Answer 1

Correct option is

B

10 ms

−1

Velocity is vector quantity so direction matters.

v

i

=25m/s,v

f

=−25m/s.

Δv=(−25)−25=−50m/s

Average acceleration =

Δt

Δv

=

5

50

=10ms

−2

.