The lower left chamber of the heart (the left ventricle) pumps blood into the aorta. According to biophysical studies, a left ventricular contraction lasts about 0.20 s and pumps 88 g of blood. This blood starts at rest and after 0.20 s is moving through the aorta at about 2 m/s.

a.) Estimate the force exerted on the blood by the left ventricle.

Express your answer to one significant figures and include the appropriate units.

b.) What is the percent uncertainty in your answer? Suppose that the uncertainty of time is 0.01 s, the uncertainty of speed is 0.5 m/s, and the uncertainty of mass is 1 g.

Express your answer using two significant figures.