If a body starts with a velocity u in a straight line with uniform acceleration f and covers a distance s in time t seconds, and st denotes the distance covered by it in the t seconds, then s2,s4,s6 are in
A
AP
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B
GP
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C
The ratio 3:7:15
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D
none of these
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Solution
The correct option is D none of these Using 2nd equation of motion the distance covered in tth second is st=ut+12ft2 ∴s2=u(2)+12f(22) s4=u(4)+12f(42) s6=u(6)+12f(62) ∵s4−s2≠s6−s4 ⇒s2,s4,s6 are not in A.P Also s4s2≠s6s4⇒s2,s4,s6 are not in G.P Also option (c) and (d) doesn't satisfy s2:s4:s6 Hence, all the options are incorrect