Q1. A sled is pushed by 12 monkeys with a constant force until it reaches a velocity of 18.9 m/s. All 12 monkeys stop pushing and the sled slides across a rough surface. From time monkeys stop pushing the box slides 12.3 meters before it comes to a stop. If the u of k of the contact is 0.21, what is the mass of the sled?
Q2. While Voyager 2 sent back pictures of Neptune during its historic flyby of that planet in 1989, the spacecraft's radio signals travelled for 4 hours at the speed of light to reach Earth. How far away was the spacecraft? Give the answer in kilometres, using powers-of-ten notation.
Q3. A butterfly at eye level is 27 cm in front of a plane mirror. You are at the back the butterfly, 88 cm from the mirror. What is the distance between your eye and image of the butterfly in the mirror?
Respond in units of cm