Question

A railway flat car has an artillery gun installed on it. The combined system has a mass M and moves with a velocity $v_0$. The barrel of the gun makes an angle a with the horizontal. A shell of mass m leaves the barrel at a speed 'u' relative to barrel in the forward direction. The speed of the flat car so that it may stop after the firing is ?

• A. $\frac{mu}{M+m}$
• B. $\left(\frac{mu}{M+m}\right)cos\alpha$
• C. $\left(\frac{mu}{M}\right)cos\alpha$
• D. $(M+m)ucos\alpha$

Answer 1

The correct option is B $\left(\frac{mu}{M+m}\right)cos\alpha$

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