1.

A boy starts moving along a circular path of radius 7m his displacement after it completed 1/2 revolution is

Answer»

Distrance travelled=1/2×2pi×r
 =pi×r
(SINCE,the distance travelled is circumference of this semicircle)
Displacement=2r
(Since,the shortest distance b/w initial and final POINT is the diameter[d] of the CIRCLE ,d=2r)

d=2r =7*2=14m



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