Question

a trolley of mass 20 kg is attached to a block of mass 4kg by massless string passing over a frictionless pulley. if the coefficient of kinetic friction between trolley and surface is 0.02 then the acceleration of the trolley and block system is ​

Answer 1

Answer:

1.5ms-2

Explanation:

4*10-t=4a

t-.02*20*10=20a

Answer 2

Explanation:

As the string is inextensible, and the pulley is smooth, therefore both the block and the trolley have the same acceleration .

Let be tension in the string.

The equation of motion of the block is

The equation of motion of the trolley is

Here,

or

Adding (i) and (ii), we get,