Question

Work energy theorem is valid in the presence of ______.

Options

• external forces only

• internal forces only

• conservative forces only

• all types of forces

Answer 1

Work energy theorem is valid in the presence of all types of forces.

Explanation:

v² − u² = 2 × a × s

Multiply both side by `1/2` m

`1/2 "mv"^2 - 1/2 "mu"^2 = "m"/2 xx 2 xx "a" xx "s"`

k_f − k_i = ma × s

⇒ k_f − k_i = F × s

ΔK = W