Question

A body of mass 4 kg is at rest. If 10 N force is applied for 10 s, calculate the work done by the force? ​

Answer 1

Concept

• work measurs the effect(displacement) produced by effort of push/ pull act (force).
• draw the figure as per the question requires.

Solution

$\implies\rm work = force\times displacement$

Given :-

• Net force = 10
• t = 10s
• object initially at rest = initial velocity (u) =0

acceleration

• F = ma = 10
• (4) a = 10
• a = 10 /4 =2.5 m/s²

displacement

• s = ut +½at² = (0)10 + ½(2.5)(10)²
• s = 0 + 2.5 × 5 ×10 = 125 m

Work done

• W = F × s
• W = 10 × 125
• W = 1250 joules

so,work done by the force is 1250 J.