Reply To: Direct Variation2018-07-06T11:36:39+10:00

Maths Made Easy Forums Standard Linear Relationships Direct Variation Reply To: Direct Variation

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The energy e produced by a falling object travelling at speed s is directly proportional to the square of its speed. The energy produced by a certain object falling at a speed of 4m/s is 136 joules. Find the energy produced when the speed of the object is 6.5m/s.

e = ks2
136 = k × 42
k = 136/16
k = 8.5

e = 8.5 × 6.52
e = 359.125

359.125 joules

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