Question

A body of mass $0.5\, kg$ is projected under gravity with a speed of $98\, m / s$ at an angle of $60^{\circ}$ with the horizontal. The change in momentum (in magnitude) of the body is

• A. 24.5 N-s
• B. 49.0 N-s
• C. 98.0 N-s
• D. 50.0 N-s

Answer 1

Answer: (B)

49.0 N-s

Answer 2

Initially body is at rest. Initial momentum $p_{1}=m \times 0$ $p_{1}= 0$ Final momentum $p_{2}=m v$ $=0.5 \times 98=49\, N$ Change in momentum $=p_{2}-p_{1}$ $=49-0=409\, N -5$