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A block of mass 15kg is placed on a long trolley. The cofficient of fricition between the block and trolley is 0.18. The trolley accelerates from rest

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A block of mass 15kg is placed on a long trolley. The cofficient of fricition between the block and trolley is 0.18. The trolley accelerates from rest with `0.5m//s^(2)` for 20s. then what is the friction force:-
A. 3.5N
B. 133.3N
C. 7.5N
D. N.O.T.
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Correct Answer - C
Pseudo force `=15xx0.5=7.5N`
`f_("max")=15xx10xx0.18=27N`
`therefore f=7.5N`
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