Question

A block $A$, whose weight is $200N$, is pulled up a slope of length $5m$ by means of a constant force $F(=150N)$ as illustrated in Figure.

What is the work done by the force $F$ in moving the block $A,5m$ along the slope?

• A. $450J$
• B. $600J$
• C. $0J$
• D. $750J$

Answer 1

The correct option is D $750J$

$W=F\times s$
Here angle between gravitational force and displacement is 90 degree, i.e perpendicular,so work done due to weight of body is zero .Hence the only force acting to move the block along the slope is constant force of $150N$
$F=150N$; $s=5m$.
$W=150\times 5=750J$
Hence the work done by 150 N is $750Joule$.