Physics

To calculate the work done by the frictional force, we can use the formula for work:

Where:

is the work done,

is the force,

is the displacement,

is the angle between the force and the direction of displacement (for friction, , so ).

 

Find the displacement

We know the object is acted on by a frictional force for 10 seconds, and its initial speed is 8 m/s. To find the displacement, we need to calculate the object's velocity after 10 seconds. Since friction is acting on the object, it will decelerate.

 

Using the formula for acceleration under constant force:

Where and :

 

Next, we use the kinematic equation ...