A strip of wood of mass M and length l is placed on a smooth" horizontal surface. An insect of mass m starts at one end of the strip and walks to the other end in time t,moving with a constant speed :

Options

A. the speed of the strip as seen from the ground is `lt l/t`
B. the speed of the strip as seen from the grund is `l/t((M)/(M+m))`
C. the speed of the strip as seen from the ground is `l/1((m)/(M+m))`
D. the total kinetic energy of the system is `1/2(m+M)((l)/(t))^(2)`

Answer

A, C