Question

If the initial velocity of a body is $V_1$ and final velocity is $V_2$ and the angle between $V_1$ and $V_1$ is $\phi$ then the change in velocity is.

• A. $V-2-V_1$
• B. $\sqrt{V_2^2+V_1^2}$
• C. $\sqrt{V_1^2+V_2^2-2V_1V_2\,\cos\,\phi}$
• D. $\sqrt{V_1^2+V_2^2+2V_1V_2\,\cos\,\phi}$

Answer 1

Answer: (C)

$\sqrt{V_1^2+V_2^2-2V_1V_2\,\cos\,\phi}$

Answer 2

Answer (c) $\sqrt{V_1^2+V_2^2-2V_1V_2\,\cos\,\phi}$