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

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

\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