A 5.00 kg crate is on a 21.0° hill. Using X-Y axes tilted down the
plane, what is the x-component
of the weight?
(Unit = N)

Please help

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

What is the rate of change in a objects position?