Author Question: The speed of a 4.0-kg object is given by v = (2t) m/s, where t is in s. At what rate is the ... (Read 72 times)

jace · **on:** Jul 28, 2018

The speed of a 4.0-kg object is given by v = (2t) m/s, where t is in s. At what rate is the resultant force on this object doing work at t = 1 s?
a. 48 W
b. 40 W
c. 32 W
d. 56 W
e. 16 W

Question 2

A 2.0-kg block slides down a plane (inclined at 40 with the horizontal) at a constant speed of 5.0 m/s. At what rate is the gravitational force on the block doing work?
a. +98 W
b. +63 W
c. zero
d. +75 W
e. -75 W