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Selina Solutions Class 9 Physics Solutions for Exercise 3C in Chapter 3 - Chapter 3 Laws Of Motion
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The correct form of Newton’s second law is:
(a) F=\frac{\Delta p}{\Delta t}
(b) \mathbf{F}=\mathbf{m}\frac{\Delta\mathbf{v}}{\Delta t}
(c) \mathbf{F}=\mathbf{v}\frac{\Delta\mathrm{m}}{\Delta t}
(d) \mathbf{F}=\mathbf{mv}
Answer:
(a) F=\frac{\Delta p}{\Delta t}
Where a motion or momentum changes either due to change in velocity or change in mass or both.
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