A man, of mass 60kg, is riding in a lift. The weights of the man, when the lift is acceleration upwards and downwards at `2ms^(-2)` are respectively.
(Taking `g=10ms^(-2)`)

Options

A. 720 N and 480 N
B. 480 N and 720 N
C. 600 N and 600 N
D. 600 N and 480 N

Answer

A

Explanation

here `,m= 60 kg , g= 10 ms^(-2) , a= ms^(-2)`
when the lift is acceleration upwards with constant acceleration a , the weight of the man is
` w. m(g -a) = 60 (10-2) = 480 N`