Question

A 13kg box is pulled across a floor (µk=0.2) at a constant velocity of 4.2m/s by...

A 13kg box is pulled across a floor (µk=0.2) at a constant velocity of 4.2m/s by a rope angled at 30o above the horizontal.

What is the tension if the box accelerates at 2.2 m/s2?

would like to know how to solve this using kinematic equations if possible, thank you!

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Answer #1

Here we consider two cases as it is not possible to have constant velocity and acceleration together.

This cannot be solved using kinematic equations.

First we draw FBD. Then we balance the forces in verticle direction.

Then we apply NSL for constant velocity case and acceleration case to find the tension in the string.

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