Carts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force F~ acts on cart A and a constant force 2F~ acts on B. Both carts start from rest. The velocities ~vA and ~vB of the bodies at the end of distance D are related by:.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.