Q.

Let r and r' denote the angles inside an equilateral prism, as usual, in degrees. Consider that during some time interval from t = 0 to t = t, r' varies with time as r' = 10 + t2.During this time, r will vary as (assume that r and r' are in degree)

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a

50 - t2

b

50 + t2

c

60 - t2

d

60 + t2

answer is A.

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Detailed Solution

In a prism: r+r′=A⇒r=A−r′∴ r=60∘−10+t2=50−t2
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Let r and r' denote the angles inside an equilateral prism, as usual, in degrees. Consider that during some time interval from t = 0 to t = t, r' varies with time as r' = 10 + t2.During this time, r will vary as (assume that r and r' are in degree)