How Do You Calculate the Mass of a Chair from Force and Acceleration?

[koolaid123]

a hotel guest starts to pull an armchair across a horizontal floor by exerting a force of 91 N (15 DEGREES ABOVE HORIZONTAL). The normal force exerted by the floor on the chair is 221 N. The acceleration is 0.076 meter/second^2(fwd). determine the mass of the chair.

the answer is 25 kg but i don't noe how to do it. What do u do when u hve an FN and an FAPP. pllzzz help

 

[Simon Bridge]

Start by drawing a free body diagram
- what are the forces on the chair?
- how is the weight of the chair related to it's mass?
- what is the sum of the vertical forces on the chair?