Question

5) A 40.0-kg wagon is towed up a hill inclined at 18.5º with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 140 N in it. Assume that the wagon starts from rest at the bottom of the hill, and neglect friction. How fast is the wagon moving after moving 80.0 m up the hill?

Answer 1

have you learned about rotating the x and y axis?

Answer 2

if we rotate the the incline down, so it is flat, it will make our math much easier, so like this

Answer 3

so, now we sum the forces in the x direction
+140 - cos(18.5)*40*9.81 = 5.7

since it's 5.7, we know there is accelearation! and remember
F = m*a, then
5.7 = ma
now what is accelerating? the wagon of 40kg so
5.7 = 40*a,
solve for a

Answer 4

@TheLacey you still here?