A block of mass 5 kg is placed at rest on a table with a rough surface. Now, if a force of 30 N is applied in the direction parallel to the surface of the table, the block slides through a distance of 50 m in a time interval of 10 s. The coefficient of kinetic friction is (given, g = 10 m/s2):

The tendency of an object to resist a change in its state of motion is called:

A box of mass 15 kg is kept on the floor of a stationary trolley. The coefficient of static friction between the box and the trolley is 0.12. To keep the box stationary relative to the trolley, the maximum horizontal acceleration (in m/s2) with which the trolley can move is: (g = 10 m/s2)