Question

A body projected with an initial velocity horizontally has kinetic energy K. If it is projected at an angle $45{}^\circ$ the initial kinetic energy will be:

• A. 0.7 K
• B. 1.41 K
• C. 2K
• D. K

Answer 1

Answer: (D)

K

Answer 2

The relation of kinetic energy ${{E}_{Ki}}=\frac{1}{2}m{{v}^{2}}$ So, it depends only on its initial speed $v$ and it does not depend on the directions of projection. Therefore, the kinetic energy will remain same.