Which of the following statements is correct for an object moving with constant speed?
A. It must have zero acceleration
B. Its velocity is constant
C. It may have acceleration
D. Its displacement equals distance
Answer: Option C
Solution (By JKSSB Mock Tests)
Constant speed does not imply zero acceleration if direction changes, e.g., uniform circular motion has centripetal acceleration. Velocity may change direction. Displacement magnitude ≤ distance. So only option B is correct.
Explanation:
Newton's second law: F = ma ⇒ a = F/m = 20 N / 5 kg = 4 m/s². Direct application of fundamental dynamics equation. Memory tip: Always convert to SI units first; here already in kg and N. Basic numerical testing F=ma application, commonly appearing in competitive exams to verify formula recall and unit handling.
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