Question

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

Answer 1

Answer:

1) 3/5

Explanation:

x - t graph ;

straight line refers uniform speed ;

speed (@ t = 3 ) = slope of the line

= (10 - 0) / (5 - 0) = 2

speed (@ t = 7 ) = slope of the other line

= (10 - 0) / (8 - 5) = 10/3

now their ratio = 2 /(10/3) = 3/5

Note :

slope = y2 - y1 / x2 - x1