In the figure: a box moves on a frictionless surface through a displacement
= -3 i m. The wind is acting on the box by force
= (2 i – 6 j) N,
a) How much work does F do during the displacement?
b) If the box has a kinetic energy of 10 J at the beginning of the displacement,
what is the kinetic energy at the end.
Sample Problem 7-3
d = -
+ W = 10 – 6 = 4 J