GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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From the equations of distance, the correct one is
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Vf = Vi + 2as
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Vf2 = Vi2 + as
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Vf2 = Vi2 + 2a
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Vf2 = Vi2 + 2as
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Explanation:
Detailed explanation-1: -That equation relates the final velocity Vf of an object starting with a velocity Vi and accelerating with a constant acceleration A for a distance D.
Detailed explanation-2: -Hence, the formula is dimensionally correct.
Detailed explanation-3: -Q. The third equation of motion (v2−u2=2as) can be derived using first two equations of motion (v=u+at and s=ut+12at2). Q.
Detailed explanation-4: -To check the correctness of physical equation, v² = u² + 2as, Where ‘u’ is the initial velocity, ‘v’ is the final velocity, ‘a’ is the acceleration and s is the displacement. From (1) and (2) we have [L.H.S.] = [R.H.S.] Hence by the principle of homogeneity the given equation is dimensionally correct.
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