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A $5$ kg block rests on a frictionless horizontal surface. A constant horizontal force of $20$ N is applied to it. Find its acceleration.
A$2$ m/s²
B$4$ m/s²
C$5$ m/s²
D$10$ m/s²
Answer & Solution
Correct answer: B. $4$ m/s²
Apply Newton's second law: $a = \dfrac{F}{m} = \dfrac{20}{5} = 4$ m/s².
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