Q1. A Volkswagen is stopped at a traffic light. When the light turns green, the driver accelerates so that the car is going 12 m/s after 5s. What is car's average acceleration?
Q2. Two horizontal forces act on a wagon, 850 N forward and 300 N backward. What force is needed to produce a net force of zero?
Q3. Agree on the mass of the earth knowing that the mean radius of the moon's orbit about the earth is 248,910 mi and that the moon requires 28.32 days to complete one full revolution about earth.