passwella.
Menu

WAEC Mathematics 2014 Question 14

Question 14

Algebraic Expressions

Make u the subject of the formula, E = (m/2g)(v2 − u2).

  1. A.u = √(v2 − 2Eg/m)
  2. B.u = √(v2/m − 2Eg/4)
  3. C.u = √(v − 2Eg/m)
  4. D.u = √(2v2Eg/m)
Show the answer and explanation

Answer: A (u = √(v2 − 2Eg/m))

Explanation

2gE = m(v2 − u2), so v2 − u2 = 2Eg/m and u = √(v2 − 2Eg/m).