How Fast Does a Block Travel on a Frictionless Surface After 3.7 Seconds?

[BrettL789123]

Block on frictionless floor!

A 3.70 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.0 N at an angle q= 25.0° above the horizontal, as shown.





What is the speed of the block 3.70 seconds after it starts moving?

I have drawn a picture but have no idea what equation to start with. know you solve for aceeleration, then once you have accel. you just solve for Vfinal

 

[edziura]

This involves force, mass and a change in speed. What principle of law relates these physcial concepts?

 

[BrettL789123]

Newtons 2nd law

 

[BrettL789123]

so what now? i know the equations but don't konw how to get acceleration cuase of the theta stuff

 

[edziura]

Assuming the vertical component is not sufficient to lift the block off the floor, use the 2nd law with the horizontal component of the applied force.