Question

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Class 9
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Answer 1

Answer:

1st uniform

2nd non uniform

3rd uniform

Answer 2

the slope of v-t graph gives acceleration

(a) uniformly accelerated motion

reason: here slope is increasing, or we can say +ve. But since the curve is a straight line, v is directly proportional to t, so acceleration is increasing, but uniformly.

force - constant accelerating (+ve) force

(b) uniform velocity

reason: as you can see, in the graph only t is increasing and there is no change in the velocity, or we can say that the slope is 0, so no acceleration.

so body moves with constant velocity.

force- 0N

(c) uniformly retarded motion

reason: here the curve does not start from the origin that means that the body has some initial velocity, which becomes 0 after some time. That means there is certain retardation acting on the body. but again, since the graph is straight line the retardation must be constant/uniform too.

force- constant retarding(-ve) force

hope it helps!!!