27 particle is thrown with a speed ...
Question

# 27 particle is thrown with a speed u at an angle with the horizontal. When the particle makes an angled with the horizontal, its speed changes to v, then (B) v=u cos O. cos o (A) v=u cos e (D) v=u sec O. cos o (C) v = u cos 0 sec o 450 with horizontal The equation for the

JEE/Engineering Exams
Physics
Solution
129
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( u x=u cos theta ) ( u y=u sin theta ) when argle ( =phi ) ( V x=v cos phi quad ) that must be equal to ( u_{x}=u cos theta ) ( mathrm{so}, quad mathrm{v} cos phi=mathrm{ucos}(mathrm{O}) ) ( V=frac{u cos theta}{cos theta}=operatorname{ucos} theta cdot sec phi ) OPtion CC ) is correep