Force and motion?

Question

At each pulse of a simplified model of a mammalian heart, about 40 g of blood is accelerated from 0.35 m/s to 0.45 m/s during a period of 0.10s. Calculate the magnitude of the force exerted by the heart muscle.

Answer 1

F = ma

a = dv/dt = 0.1/0.1 = 1m/s/s

so F = 0.04 * 1 = 0.04 N