Comets travel around the sun in elliptical orbits with large eccentricities. if a comet has speed 1.8×104 m/s when at a distance of 2.2×1011 m from the center of the sun, what is its speed when at a distance of 4.2×1010 m. express your answer using two significant figures.
=/s.

9.4 x 10⁴ m/s

Explanation:

In circular or elliptical orbits , the angular momentum is conserved because torque is zero.  

mr₁v₁ = mr₂v₂

2.2 x 10¹¹ x 1.8 x 10⁴ = 4.2 x 10¹⁰ v₂

v₂ = 9.42 x 10⁴ m/s.

= 9.4 x 10⁴ m/s

what is the question?

no simpler subs form complex ones. synthesise = make