Question

A block of mass 2.5 kg is pushed 2.20 m along a frictionless horizontal tale by a constant 16 N force directed ${25}^{\circ }$ above the horizontal . The work done by the normal force exerted by the table is

• A. 31.9 J
• B. 29 .4 J
• C. Zero
• D. 942 J

Answer 1

The correct option is A 31.9 J

$\begin{array}{c}Workisforcetimesdis\tan ce,butwehaveanangle,atwhichtheforceisappliedso,\\ W=F\cos \theta \Delta x\\ =16.0N\cos \left(-{25}^0\right)\left(2.20m\right)\\ =31.9J\end{array}$

Hence,'

option $\left(A\right)$ is correct answer.