Question

The maximum and minimum distance of a comet from the sun are$8 \times 10 ^ { 12 }$m and $1.6 \times 10 ^ { 12 }$m. If its velocity when nearest to the sun is 60 m/s, what will be its velocity in m/s when it is farthest

• A. 12
• B. 60
• C. 112
• D. 6

Answer 1

Answer: (A)

12

Answer 2

According to conservation of angular momentum

constant

$\therefore$ $v _ { \min } = v _ { \max } \times \frac { r _ { \min } } { r _ { \max } }$ $= 60 \times \left( \frac { 1.6 \times 10 ^ { 12 } } { 8 \times 10 ^ { 12 } } \right) = 12 \mathrm {~m} / \mathrm { s }$