Two horizontal forces f1 and f2 act on a 4 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. f1 is in the positive direction of x axis and has magnitude = 7 n. f2 has magnitude 9 n. the image below gives velocity as a function of time along x axis. what is angle between f1 and f2?

Explanation:

The figure is missing, find it in attachment.

The figure shows the velocity along the x-axis, , versus time. The slope of the line gives us the acceleration along the x-axis, which is therefore given by:

Now we can apply Newton's second law along the x-axis:

where

is the resultant force along the x-axis

m = 4 kg is the mass of the disk

is the acceleration along this axis

Solving,

So now we know that this is the component of resultant force along the x-axis. The resultant force is given by two forces:

F1, which acts along the x-direction

F2, which acts at a certain angle

So the component of the resultant along the x-axis can be written as

where we know:

Solving for , we find:

elctricity and magnet is conversion to it