[填空题]
According to a simplifiedq0 m, o4r 0xq+:93uee:c 5fkmco 8gy0zlozqpg model of a mammalian heart, at ejg1cp6 133m xi2gh5l1qd p 0dg v2trtmach pulse approximately 20q5c pj13d6hmp2g1ditvg 2g l3rmx 0t1 g of blood is accelerated from 0.25 $\mathrm{~m} / \mathrm{s}$ to 0.35 $\mathrm{~m} / \mathrm{s}$ during a period of 0.10 s . What is the magnitude of the force exerted by the heart muscle?
