Physics
Grade-7
Easy

Question

DirectionCalculate the missing term
m = ?
v = 30 m/s
K.E. = 270 J

  1. 0.6 kg
  2. 10 over 6 kg
  3. 10 kg
  4. 6 kg

hintHint:

0.6 kg

The correct answer is: 0.6 kg


    KE = 1 half mv2
    270 = 1 half × m × (30)2
    straight m space equals space fraction numerator begin display style stack up diagonal strike 270 with 3.9 on top end style space cross times space 2 over denominator up diagonal strike 30 space cross times space up diagonal strike begin display style 30 with 10 below end style end strike end fraction
    6 over 10 = 0.6 kg

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