maglev trains, like the one shown in the picture, use magnet fields to travel up to 600 miles per hour. magnets on the bottom of the train and on the tops of the rails have similar magnetic poles. based on properties of magnets, how do these magnets affect the train? a)the two magnetic fields repel each other, causing the train to levitate, or hover, above the rails. b)the powerful magnets greatly reduce the force of gravity, resulting in less friction and greater speed. c)the train is able to stop immediately because the magnets on the rails attract the magnets on the train. d)maglev trains have extremely powerful magnets, greatly decreasing the force of gravity and allowing them to float.

Can someone explain to me how to do this problem ?

Jason and mia are both running in a race. as they approach the finish line, you being the physicist that you are decide to time how long it takes them to reach the end of the race. when you start your stop watch (you can take this as time t = 0 s) you notice that mia is an unknown distance d ahead of jason and both are moving with the same initial velocity v_0. you also notice that jason is accelerating at a constant rate of a_j, while mia is deaccelerating at a constant rate of -a_m. jason and mia meet each other for the first time at time t = t_1. at this time (t = t_1) jason's velocity is two times that of mia's velocity, meaning v_j (t_1) = 2v_m (t_1). a) draw the position vs. time graph describing mia's and jason's motion from time t = 0 to time t = t_1. clearly label your axes and initial conditions on your graph. b) draw the velocity vs. time graph describing mia and jason's motion from time t = 0s to time t = t_1. clearly label your axes and initial conditions on your graph. c) how long from when the stop watch was started at t = 0s did it take mia and jason to meet? express your answer in terms of know quantities v_0, a_m, and a_j. d) when the stop watch started at time t = 0s, how far apart, d, were mia and jason? express your answer in terms of know quantities v_0, a_m, and a_j.

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest