Acceleration of Decelerating Block · PhysicsBowl 2017 #12

Physics · mechanics

Problem

A 5.00 kg block slides with uniform acceleration on a horizontal surface for 5.00 s. The block's kinetic energy strictly decreases from 50.0 J to 20.0 J in this time. Which one of the following choices best represents the magnitude of the block's acceleration during the motion described? (A) 3.43ms23.43 \frac{m}{s^2} (B) 2.40ms22.40 \frac{m}{s^2} (C) 1.20ms21.20 \frac{m}{s^2} (D) 0.329ms20.329 \frac{m}{s^2} (E) 0.232ms20.232 \frac{m}{s^2}

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