Answer :
No option , The curler apply to the stone to bring it up to speed is 42.85 N.
F = 20*3/1.4 = 42.85 N
3 *3 = 2*u*9.8*40
u = 0.0114
Despite their similarities, distance and displacement have very different meanings, as do speed and velocity. Speed, a scalar quantity, describes "how quickly an object is travelling." You can think of speed as the rate at which an object travels a distance. An object moving quickly has a high speed and travels a fair distance in a brief period of time. In contrast, a slow-moving object travels a comparatively short distance in the same amount of time because of its low speed. Zero speed refers to an object that is completely stationary.
[Speed = Distance Time] is the general formula for calculating an object's speed. The SI speed unit is m/s.
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