Question

If the initial velocity of a train is 20 m/s and after 10 s it acquires a velocity 40 m/s by increasing uniformly so the average velocity of the train for this time interval is:
(a) 10 m/s
(b) 20 m/s
(c) 30 m/s
(d) 50 m/s

Answer 1

Step-by-step explanation:

Correct option is

B

4 m/sec

v

i

=10 m/s and v

f

=20 m/s

Acceleration of the body =

5

20−10

m/s

2

a=2 m/s

2

Velocity of the body at t=−3 sec

v=u+at

v=10−2×3

v=4 m/s