Answer to Question #292753 in Mechanics | Relativity for bookaddict

Question

What is the work done by gravity when a wooden block of mass 2 kg slides 3 m down a slope inclined at 30°?

A. 3 J

B. 29.43 J

C. 6 J

D. 58.86 J

Answer 1

m=2kg

Angle$(\theta)=30°$

h=3m

Now We know that

$$V=\sqrt{2gh}=\sqrt{2\times9.8\times3}=7.66m$$

Work done by gravity

$W=mghsin\theta$

$$W=2\times9.8\times3\times sin30°=29.43J$$

Option (b) is correct option