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23. nsmall balls each of mass 'm impinge clastically cach second on a surface with velocity u. The force experiencedby he surface will be:(C) 4 mnu(D) mu2(A) mnu(B) 2 mnu

Answer»

for 1 ball

the impulse provided will be change in momentum = mu -(-mu) = 2mu

so F.t = 2mu F = 2mu/t = 2mu

now for n ball..the total value is 2mnu.

option B



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