Question

Aplanet moves around the sun.Agivenpoint P ,it is closed from the sun at a distance d1and has a speed v1.At onother point Q ,whenit is farthest from thre sun at adistance d2,its speed will be

Answer 1

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

a)d21v1d22b)d2v1d2c)d1v1d2d)d22v1d12

A)  

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Angular momentum of the planet remains constant

mv1d1=mv2d2

=>v2=v1d1d2

Hence b is the correct answer.

Answer 2

it speed will be 180