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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.

A) 2.2KJ

B) 140.0KJ

C) 1.4K

D) 562.5J

### 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

## 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