If we apply a breaking system to a skateboard while the speed of the skateboard

Question

If we apply a breaking system to a skateboard while the speed of the skateboard is 10Milies per hour, the rider average weights is 180bounds while his height is 170 cm. when is the rider going to reach the stopping point which is the speed will be 0? You can assume the distance as it is 50meters. can you answer this ? If we apply a breaking system to a skateboard while the speed of the skateboard is 10Milies per hour, the rider average weights is 180bounds while his height is 170 cm. when is the rider going to reach the stopping point which is the speed will be 0? You can assume the distance as it is 50meters. can you answer this ?

Explanation / Answer

v^2-u^2=2as

where

a=retardation

v=0

u=4.444m/sec

solving we get

a=-0.197m/sec^2

now

v=u+at

t=-u/a=-4.444/-0.197=22.558 sed

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