d
(d)Area between curve and displacement axis
= \(\frac{1}{2} \times (12 + 4) \times 10\)\(= 80 J\)
In this time body acquire kinetic energy = \(\frac{1}{2}m{v^2}\)
by the law of conservation of energy
\(\frac{1}{2}m{v^2} = 80J\)
\(⇒\) \(\frac{1}{2} \times 0.1 \times {v^2} = 80\)
\(⇒\) \(v^2 = 1600\)
\(⇒\) \(v = 40 m/s\)