If 120 joules of work are performed over 3 seconds, what is the power?

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Multiple Choice

If 120 joules of work are performed over 3 seconds, what is the power?

Explanation:
Power is the rate at which work is done, so it equals work divided by time. P = W / t. Here, 120 joules are done in 3 seconds, so P = 120 J / 3 s = 40 J/s, and since a joule per second is a watt, the power is 40 watts. If the same amount of work happened faster, the power would be higher (for example 120 J in 2 s is 60 W); if slower, the power would be lower (120 J in 4 s is 30 W).

Power is the rate at which work is done, so it equals work divided by time. P = W / t. Here, 120 joules are done in 3 seconds, so P = 120 J / 3 s = 40 J/s, and since a joule per second is a watt, the power is 40 watts. If the same amount of work happened faster, the power would be higher (for example 120 J in 2 s is 60 W); if slower, the power would be lower (120 J in 4 s is 30 W).

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