Physics
A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

50 J
100 J
75 J
150 J

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Physics
Purpose of an optical filter is to

Reflect lights of different colours
Transmit or absorb light of different colours
Dispense light into component colours
Refract light of different colours

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