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If you watch a train go by at 20 meters per second at what speed with people sitting on the train be moving relative to you?
The people on the train are watching you go by at 20mps. It's all relative.
How far does a car going 20mps and decelerating at -5mps2 go before it comes to a stop?
Initial speed = 20 m/sFinal speed = 0Average speed = 1/2 (20 + 0) = 10 m/sDeceleration = 5 m/s2Time to stop = 20/5 = 4 secondsDistance = (average speed) x (time) = (10) x (4) = 40 mWhen we first looked at this question, we thought that the 'm' was 'miles'.But that would have meant that the car is going 72,000 mph until it startsdecelerating at 820 G's, and we realized that before it ever came to a stop,there would be nothing left of the driver and very little of the car. So wedecided that 'm' is most likely 'meters'.
A plane is traveling 20 meters in 1 second What is it speed?
20mps
A motorcycle can accelerate from 0 to 60 mph in 3 seconds What is its acceleration in miles per hour per second?
20mps
If you watch a train go by at 20 meters per second at what speed with people sitting on the train be moving relative to you?
The people on the train are watching you go by at 20mps. It's all relative.
How far does a car going 20mps and decelerating at -5mps2 go before it comes to a stop?
Initial speed = 20 m/sFinal speed = 0Average speed = 1/2 (20 + 0) = 10 m/sDeceleration = 5 m/s2Time to stop = 20/5 = 4 secondsDistance = (average speed) x (time) = (10) x (4) = 40 mWhen we first looked at this question, we thought that the 'm' was 'miles'.But that would have meant that the car is going 72,000 mph until it startsdecelerating at 820 G's, and we realized that before it ever came to a stop,there would be nothing left of the driver and very little of the car. So wedecided that 'm' is most likely 'meters'.
