a).Give an expression for the speed of an athlete if he takes time ‘t’ to go round a circular
track of diameter ‘d’.
(b). Giving one example each, distinguish between uniform acceleration and non uniform
acceleration.
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Answer:
a )Distance of one round of circular motion of 'r' radius
= circumference of circle
= 2πr unit
number of rounds = n (here 'n' means how much time he revolve around the circular ground)
total distance = n2πr
speed = distance/time
V = n2πr/t
b) When there is equal change in time in equal interval of distance it is called uniform acceleration.
Example:-when u drive at a place where there is no obstruction(people).
When there in unequal interval of time in unequal distance it is called non uniform acceleration.
Example:-When you drive in a market.
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