physics
posted by p on .
A student in a lab exerts a 14 N force to pull a block a distance of 63 cm. If a total of 8 J of work is done, the angle between the force and the displacement is
none of the above
89°
25°
61°
65°

A 1.6kg block is dropped from 66 cm above a spring in equilibrium. The force constant for the spring is 142 N/m. Calculate the maximum compression in the spring.

work = force (in direction of motion) X distance
W = (F cos t) x
cos t = W/Fx
t = arccos(W/Fx) = arccos [8/(14)(0.63)] = arccos 0.907 = 24.9 = 25 degrees