Question

Velocity of particle of mass 2 kg change from $\overline{vi}=-\widehat{2i}-\widehat{2j}m/s$to$\overline{v2}=(\hat{i}-\hat{j})m/s$ after colliding with a plane surface.

(Multiple correct answers)

• A. The angel made by the plane surface with the positive x-axis is$\overline{v2}=(\hat{i}-\hat{j})m/s$
• B. the angel made by the plane surface with the positive x-axis is${tan}^{-1}\left(\frac{1}{3}\right)$
• C. the direction of change in momentum makes an angel ${tan}^{-1}\left(\frac{1}{3}\right)$with the positive x-axis.
• D. The direction of the change in momentum makes an angel $90$+${tan}^{-1}\left(\frac{1}{3}\right)$ with the place surface

Answer 1

Answer: (C), (D)

The correct options are
C the direction of change in momentum makes an angel ${tan}^{-1}\left(\frac{1}{3}\right)$with the positive x-axis.
D The direction of the change in momentum makes an angel $90$+${tan}^{-1}\left(\frac{1}{3}\right)$ with the place surface