Question

15. If a body is moving on a circular path a radius 21 cm with velocity of 2 m/s, then time taken by the body to complete half revolution is (a)11s (b)22 s (c) 445 (d) 33 s​

Answer 1

Answer:

D) 33 seconds

Explanation:

the total distance is,

2*22/7*r = 2*22/7*21 = 132cm

distance to cover is 132/2 = 66cm

speed = dist * time

time = dist/ speed = 66/2

time = 33 seconds

hope you understand

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Answer 2

Answer:

I think there's some mistake with the units.

The speed should be 2 cm/sec, or the radius should be 21m. In that case, the answer is option D

Explanation:

Half a circle, means the distance to be travelled is

d = πR = (22/7)*(21) = 66 units

v = 2 units/sec

Time taken t = d/v = 33seconds