A 60 point 0 kilograms object is moving east at 8.00 meters per second , and then slows down to 4.00 meters per second How much work was done?

Work equals the change in kinetic energy: W = ½m(v_f² − v_i²). Using 60.0 kg, 4.00 m/s, and 8.00 m/s gives W = ½(60.0)(4.00² − 8.00²) = 30(16 − 64) = −1,440 J. The work is negative because the object slows down, so the correct choice is negative 1,440 J.

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