Question

Position(x)-time(t) graph of an object is shown in
the figure. Ratio of speed of the particle at t = 3
to that at t = 7 second is
1-3/5
2-5/3
3-5/8
4-1/1​

Answer 1

Answer:

-3/5

Explanation:

Refer to the material.

Answer 2

Answer:

-3/5 m/s.

Explanation:

To find the velocity at the time 3 second and 7 second, we need to find the average velocity at the time interval 0 to 5 seconds to get the 3 second and from 5 to 8 seconds to get the 7 second velocity.

Hence, for the 3 second the velocity will be 10-0/5-0 which on solving we will get that 10/5 which is 2 m/s. So, at time 3 second, the velocity will be 2 m/s. For the other part the average velocity will be (0-10)/(8-5) which will be -10/3 m/s. Hence, for 7 second the velocity will be -10/3 m/s. Since, there is linear increase in velocity with time so the velocity is constant for each of the sides.

So, 2/(10/3) which on solving we will get -3/5 m/s.