A planet moves around the sun. at a given point P, it is closest from the sun at a distance d1 and has a speed v1. At another point Q, when it is farthest from the sun at a distance d2, its speed will be

Q: A planet moves around the sun. at a given point P, it is closest from the sun at a distance d1 and has a speed v1. At another point Q , when it is farthest from the sun at a distance d2 , its speed will be

(a) $\frac{d_1^2}{d_2^2} v_1 $

(b) $\frac{d_2}{d_1} v_1 $

(c) $\frac{d_1}{d_2} v_1 $

(d) $\frac{d_2^2}{d_1^2} v_1 $

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Ans: (c)