Question

Question 61:
Three speed-time graphs are given below :

Which graph represents the case of:
(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower ?
(ii) a trolley decelerating to a constant speed and then accelerating uniformly ?

Lakhmir Singh Physics Class 9

Answer 1

Answer:

1. Graph c

2. Graph a

Explanation:

(i) Graph (c): The speedof the ball goes on decreasing uniformly as it moves upward zero at the highest point, and then increases uniformly as it moves downward.

(ii) Grap(a): The speed of the trolley decreases uniformly, then it moves at a constant speed, and then the speed increases uniformly.

Answer 2

Explanation:

Answer:

1. Graph c

2. Graph a

Explanation:

(i) Graph (c): The speed of the ball goes on decreasing uniformly as it moves upward zero at the highest point, and then increases uniformly as it moves downward.

(ii) Grap(a): The speed of the trolley decreases uniformly, then it moves at a constant speed, and then the speed increases uniformly.