a box of mass 7 kg is pulled up a frictionless 30 degree incline by a force of 381 N which acts parallel to the incline surface. the box has an initial speed of 5m/s and is pulled 9m. what is the speed of the box at the end of the 9m.

Answer 1

Initial KE + Work added = final KE + GPE

1/2(7)5^2 + 381*9 = 1/2(7)vf^2 + 7(9.8)h

Find h using trig for a triangle with 30o angle and 9 m hypotenuse.