The velocities of a body moving along a straight line with constant acceleration are 10 m/s at t=4s and 20 m/s at t=9s. The velocity of the body at t=1s is:

# The velocities of a body moving along a straight line with constant acceleration are 10 m/s at t=4s and 20 m/s at t=9s. The velocity of the body at t=1s is:

1. A

4 m/s

2. B

6 m/s

3. C

7 m/s

4. D

8 m/s

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### Solution:

To find the acceleration,

a =

= 2 m/s2

To calculate the initial velocity at t=1:

v=u + a$∆t$

10=u+a(4-1)

Put a = 2 m/s2

u= 4 m/s at t=1 sec.

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