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If the nth term of the AP is 7n – 9, the...

If the nth term of the AP is 7n – 9, then the first term is ________
a) 1
b) 6
c) 3
d) -2

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
A disc is set rolling with a velocity v from right to left. It has attained a height h, therefore
`1/2mV^2+1/2Iomega^2=mgh`
`rarr 1/2mV^2+1/2xx1/2mR^2omega^2=mgh`
`rarr 1/2V^2+1/4V^2=gh` ltbr.gt `rarr (3/4)V^2=gh`
`rarr (3/4)V^2=gh`
`rarr h=(3/4(v^2/g)`
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