Physics

Problem

A body of mass 5 kg starts from the origin with an initial velocity

\vec{u} = 30\hat{i} + 40\hat{j}\,\text{ms}^{-1}

. If a constant force

\vec{F} = -(\hat{i} + 5\hat{j})\,\text{N}

acts on the body, the time in which the y-component of the velocity becomes zero is 1) 5 s 2) 20 s 3) 40 s 4) 80 s 1) 5 s 2) 20 s 3) 40 s 4) 80 s