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Q.

 Hailstones fall from a certain height. If only 1% of the hailstones melt on reaching the ground, find the height from which they fall. (g=10 ms-2. L=80 calorie/g and J= 4.2J/calorie)

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a

236 m

b

536 m

c

336 m

d

436 m

answer is A.

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Detailed Solution

1n=1100; h=?g=10m/s2, L=80cal/gm=80cal10−3kg=80×103m̸gh=Jm̸ℓn⇒h=JLng=4.2×8×103100×10=336m

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