A box is dropped onto a conveyor belt moving at 3.40 m/s. If the coefficient of friction between the box and the belt is 0.270, how long will it take before the box moves without slipping

t=1.28 seconds

Explanation:

The newton law of motion said

Force= mass × acceleration

The friction force said

a= u . g

a = 0.270 × 9.81

a=2.65m/s^2

Now applied the kinematics equation

v= u+ at

v=3.40 and u= 0

Now

t= 3.40/2.65

t=1.28 seconds

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )