The fol- 50. Jake pushes crates starting from rest across his classroom
floor for 3 s with a net force as shown. For each crate,
rank the following from greatest to least.
m/s
100 N
75 N
50 N
kg
30 kg
20 kg

10 kg
A
B
C
(a) Impulse delivered
(C) Final speed
(b) Change in momentum
(d) Momentum in 3 s

Iwould think it would be efficiency.

Let l be the vertical distance of pendulum when it makes 25.0 degree angle to verticalcos(25.0) = l / 1.20 ml = (1.20m)(cos 25.0)so the height, h, of the pendulum above the equilibrium position is h = 1.20m - (1.20m)(cos 25.0)ep,i + ek, i = ep, f = ek, fwhen pendulum held at 25.0 degrees, initial kinetic energy is 0 jwhen pendulum passes through equilibrium point, final potential energy is 0jep, i = ek fmgh = 1/2 m v^2gh = 1/2 m v^2v = √(2gh)v = √[2 * 9.81 m/s² * ( 1.20m - (1.20m)(cos 25.0) )]v = 1.5 m/s