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Q.

The length of second's hand in watch is 1 cm. The change in velocity of its tip in 15 seconds is

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a

zero

b

π30 cm/s

c

π230cm/s

d

π302cm/s

answer is D.

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Detailed Solution

Δv=2vsin9002 = 2vsin450 =2v×12  = 2v

= 2×rω = 2×1×2π60=2π30cm/s

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