Question

A boy pushes a book kept on a table by applying a force of 4.5 N.Find the work done by the force if the book is displaced through 30 cm along the direction of push?​

Answer 1

Work = force * displacement
Work done is
4.5*30= 135 joules

Answer 2

Answer:

• $1.35\: J$

Explanation:

$Given:-$

• Force applied = 4.5 N

• Displacement = 30 cm

• cos θ = 0°

$ToFind:-$

• Work done

$Solution :-$

$\boxed{Work Done = Fscos\: \theta}$

$\implies \:\:W= 4.5 N \times 30 cm \times cos 0^{\circ}$

$\implies \:\: W = 4.5 N \times 30 \times 0.01 m \times1$

$\implies \:\: W = 4.5 N \times 0.3 m \times 1$

$\implies \:\: W = 4.5 N \times 0.3 m \times 1$

$\implies \:\:W = 1.35 J$

Hence, The work done is 1.35J