Question

A 2.0 kg lunch box is sent sliding over a frictionless surface, in the positive direction of an x axis along the surface. Beginning at time t=0, a steady wind pushes on the lunchbox in the negative direction of the x-axis. Estimate the kinetic energy of the lunckbox at a)t=1.0s b)t=5.0s c)How much work does the force from the wind do on the lunchbox from t=1.0s to t=5.0s?

How would I find the work done, if I don't have the force?


You must have some measure of the motion (distance, or velocity) in the x direction.

Answer 1

2.0 kg lunchbox is sent sliding over a frictionless
surface, in the positive direction of an x axis along the surface.
Beginning at time t ! 0, a steady wind pushes on the lunchbox in the
negative direction of the x axis. Figure 7-51 shows the position x of
the lunchbox as a function of time t as the wind pushes on the lunchbox.
From the graph, estimate the kinetic energy of the lunchbox at
(a) t ! 1.0 s and (b) t ! 5.0 s. (c) How much work does the force
from the wind do on the lunchbox from t ! 1.0 s to t ! 5.0 s?