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If force F is reprsented in different, w...

If force F is reprsented in different, ways then which of the following is correct and which are not correct ? M= mass, a = acceleration r= radius, v= velocity d= distance t=time.
(a) `F=(mv^(2))/(r), (b) F=ma, (c) F=(ma)/(d)`
(d) `F=ma+(1mv^(2))/(r) (e) F=(md^(2))/(t^(2))`

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The correct Answer is:
(a),(b), (d) is right and (c) and (e) is wrong
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