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How many seconds to stop at 30 mph?
That depends on the driver's reaction time, the weight of the car, the condition of the brakes, and the composition and condition of the pavement.
How much force is needed to stop a car that weighs 500kg and is going at 30 meters per second?
Depends on the amount of time we are given to stop the car. Force = mass x acceleration If we are given 1000 000 seconds to stop the car Force = 500kg * 30/1000000 = 0.015N
Stopping distance at 60 miles per hour?
60 MPH = 88 fps. (fps=1.467 * MPH). If the vehicle deceleration rate is 20 fpsps, then stopping time = 88/20 = 4.4 seconds. Since there is a 1 second delay (driver reaction time) in hitting your brakes (both recognition and reaction time is often 2 seconds), the total time to stop is 5.4 seconds to 6.4 seconds.
You are running at the rate of 24 feet per second in a 40 yard dash it take you 4 seconds to slow to a stop what is your acceleration?
-6 ft/sec2
A car slows to a stop in 5 seconds if it was going 80 kilometers an hour what was its acceleration?
You can't figure "acceleration" from this information. Maybe you meant "Deceleration"? Ask again.
