Two sumo wrestlers run towards each other, the first has a mass of 150kg and is running at 14m/s. The second wrestler has a mass of 200kg and is running with
a speed of 18m/s. They collide in a perfectly elastic collision. If the second
wrestler bounces backwards at 4m/s. Find the final velocity of the first wrestler.

26.4 is about the right time

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.