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An object of mass 7kg is moving at a constant velocity of 20m/s. Determine the ki...


Question

An object of mass 7kg is moving at a constant velocity of 20m/s. Determine the kinetic energy.

Options

A) 2.2KJ

B) 140.0KJ

C) 1.4K

D) 562.5J

The correct answer is C.

Explanation:

Kinetic energy (K.E) = \(\cfrac{1}{2}mv^2\)
\(= \cfrac{1}{2} \times 7 \times (20)^2 = \cfrac{1}{2} \times 7 \times 400\)
\(= 7 \times 200 = 1400\)J
\(= 1.4\)kJ

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Dicussion (1)

  • Kinetic energy (K.E) = \(\cfrac{1}{2}mv^2\)
    \(= \cfrac{1}{2} \times 7 \times (20)^2 = \cfrac{1}{2} \times 7 \times 400\)
    \(= 7 \times 200 = 1400\)J
    \(= 1.4\)kJ