3A car moves in a straight line with velocity v(t) = 1.9t+0.5. a. What is the car's initial velocity? What is its acceleration?
b. What does the v vs. t graph look like for the first 10 seconds of its motion?
c. What does the a vs. t graph look like for the first 10 seconds of its motion?
d. How far has the car traveled after 7 seconds?
e. What does the x vs. t graph look like for the first 10 seconds of its motion?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.