Average Speed of Decelerating Block · PhysicsBowl 2017 #11

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. What is the average speed of the block during the motion described? (A)

7.00 \frac{m}{s}

(B)

3.74 \frac{m}{s}

(C)

3.65 \frac{m}{s}

(D)

2.65 \frac{m}{s}

(E)

2.58 \frac{m}{s}

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