Physics-
General
Easy
Question
A 10 kg brick moves along an 
-axis. Its acceleration as a function of its position is shown in figure. What is the net work performed on the brick by the force causing the acceleration as the brick moves from 
to 
m?
- 4 J
- 8 J
- 2 J
- 1 J
The correct answer is: 8 J
According to the graph the acceleration 
varies linearly with the coordinate . We may write 
, where 
is the slope of the graph.
From the graph
The force on the brick is in the positive -direction and according to Newton’s second law, its magnitude is given by
If 
is the final coordinate, the work done by the force is
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