Tripling the speed of the motor car multiplies the distance needed for stopping it by
Tripling the speed of the motor car multiplies the distance needed for stopping it by
$3$
$6$
$9$
Some other number
Tripling the speed of the motor car multiplies the distance needed for stopping it by
$s \propto {u^2}$ i.e. if speed becomes three times then distance needed for stopping will be nine times.
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