Two blocks A and B are placed one over the other on a smooth horizontal surface. The maximum horizontal force that can be applied on the lower block A, so that A and B move without separation is 49N. The coefficient of friction between A and B is (take g = `9.8ms^(-2)` )

Options

A. 0.2
B. 0.3
C. 0.5
D. 0.8

Answer

c

Explanation

Equation of motion of lower block is
`F=mu(M_(A)+M_(B))*g`
`mu=(F)/((M_(A)+M_(B))g)`
`=(49)/(10xx9.8)=(1)/(2)=0.5`