question_answer

Find the force exerted by 5 kg block on floor of lift, as shown in the figure. (Take\[g=10\text{ }m/{{s}^{2}}\])

A)   100 N                       

B)  200 N

C)   105 N                       

D)  210 N

Correct Answer: C

Solution :

            \[{{N}_{1}}=2g+5\times 2=30N\]             and \[{{N}_{2}}=5g+25+{{N}_{1}}=50+25+30\]             \[\Rightarrow \]\[{{N}_{2}}=105\,N\] Hence, the correction option is [c].