A2.4kg cannon is used to propel a 56-gram tennis ball with a speed of 160 m/s. what is the recoil speed of the cannon, tennis ball, and total before and after? what is the velocity?

You can find results and justify them? you can test your hypothesis

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.

To find speed, or mph, use distance/time.

The statement that best describes the object on the right is a bar magnet with its north pole on the left.