Question

A particle is moving in a circular path radius.what will be the product of the difference between the distance covered and displacement after half circle and sum of the distance covered and displacement after a half circle.
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Answer 1

Answer:

Originally Answered: A particle is moving in a circular path of radius R. What would the displacement after half a circle be? Displacement is shortest distance between starting point and end. When particle moves along half circle, it covers half the circumstance therefore distance covered is (2×pi×r)/2 = pi× r.

explanation

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Answer 2

speed - 75km/hr

time - 1 hour or 60 minutes

so distance will be - 75/1 = 75km

60 minutes = 75 km

1 minutes = 75/60

20 minutes = 75/60*20 = 15

1st answer will be 15 km