Question

A body of mass 2 kg is at rest is subjected to a force of 8n what is ke acquired

Answer 1

By SECOND LAW OF NEWTON :

f = ma

∴ 8 = 2×a

⇒ a(acceleration) = 4m/s²

By first equation of motion :

(final velocity ) v = u+a×t { u = (initial velocity) }

u = 0 (as body was initially at rest)

⇒ v = 0 +2×t

⇒ v = 2t

K.E. = 1/2mv²

K.E. = 1/2 × 2 × (2t)²

⇒ K.E. = 4t²