Physics
Grade-7
Easy

Question

DirectionCalculate the missing term
m = 12 kg
v = ?
K.E. = 240 J

  1. square root of 10 m/s
  2. 20 m/s
  3. 40 m/s
  4. fraction numerator 10 over denominator square root of 2 end fraction m/s

Hint:

2√10 m/s

The correct answer is: 2 square root of 10 m/s


    KE = 1 half mv2
    240 = 1 half × 12 × v2
    straight v squared space equals space 240 over 6

    = 40
    v = 2 square root of 10 m/s

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