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Q.

Consider a ball having mass 20 kg is stationary at the top of the hill having height 100 m as shown. Find the velocity attained by the ball when it reaches the base at height 20 m. Assume no slipping.

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a

10 m s−1

b

40 m s−1

c

20 m s−1

d

34 m s−1

answer is D.

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Detailed Solution

mgh=12mν21+k2R2=12mν2⋅75∴12mν275=mg×80or ν2=2×10×80×57=1600×57or ν=34m/s

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Consider a ball having mass 20 kg is stationary at the top of the hill having height 100 m as shown. Find the velocity attained by the ball when it reaches the base at height 20 m. Assume no slipping.