Quartz has a density of 2.2 g/cm. You have a sample with a volume of 45 cm. What is its mass?
20.45 g

99 g

45 g

0.05 g

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.