_5. A 2 kg toy truck moves along a frictionless surface with a uniform speed of 5 m/s. What is its kinetic energy?
A. 0.25 J B. 25 J C. 2.5 J D. 250 J
A. 0.25 J B. 25 J C. 2.5 J D. 250 J
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Answer:
K.E. = 1/2 mv²
= 1/2(2 kg) × (5m/s)²
= 1 kg × 36 m²/s²
= 25kg.m²/s²
= 25 J
b.
Explanation: