Categorize the following choices as either "acceleration" or "not acceleration." 1. A sprinter slowing down to a stop after a race

2. A rocket blazing off a launchpad

3. A student sitting still at her computer

4. A dog speeding up to chase a cat

5. A yo-yo being twirled in a circle

6. A car driving at 70 mph on a straight highway

Wind or electric energy force force of friction

The answer is d, you can easily test a theory! hope i you : )

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.