The answer will depend on the condition of the brakes and tyres. It will also depend on whether or not the road is dry and and on the amount of load being carried.
75 Feet
Stopping distance at 30mph = 23m
about 22 metres
The overall stopping distance would be around 122m (400ft) This is made up of a thinking distance of 24m (79ft) and an actual stopping distance of 98m (321ft). The thinking distance is around 3m for every 10mph of speed and the overall stopping distance is calculated as follows: 2x20 ft at 20mph 2.5x30 ft at 30mph 3x40 ft at 40mph 3.5x50 ft at 50mph 4x60 ft at 60mph 4.5x70 at 70mph 5x80 at 80mph = 400 ft james s
At 60mph, it generally takes longer to stop compared to 30mph due to the higher speed and momentum. Factors such as reaction time, braking distance, and road conditions also affect stopping time. In general, stopping at 60mph will take more than twice the distance compared to stopping at 30mph.
the answer is 30mph
120ft.I discovered a formula for calculating it for any given speed. I've tested it for 20mph, 30mph,40mph,50mph,60mph and 70mph. The formula is as follows:overall stopping distance in ft = Sp x (1 + Sp/20).Where Sp is the magnitude of the speed in mph.So at 40mph it is:40 x (1 + 40/20) = 50 x (1 + 2) = 40 x 3 = 120ft.
A car travelling at 40mph will have a lot more momentum than one travelling at 30mph, so there would be more force for it to hit the pedestrian with; it will also take much longer to come to a halt.
they wer from 10mph to 30mph
Sources from the time of the opening of the Liverpool to Manchester railway in 1830 suggested that people were afraid of the effects on the human body, of travelling at over 30mph. They also at first despised travelling in tunnels, as they believed it was one step closer to Hell!
30mph
Trains in some countries go fast, some go at over 200mph. In other countries you would be lucky to get a train travelling faster than 30mph.