Laws of Motion 5 Question 6
6. A ship of mass $3 \times 10^{7} kg$ initially at rest, is pulled by a force of $5 \times 10^{4} N$ through a distance of $3 m$. Assuming that the resistance due to water is negligible, the speed of the ship is
(a) $1.5 m / s$
(b) $60 m / s$
(c) $0.1 m / s$
(d) $5 m / s$
(1980, 2M)
Objective Questions II (One or more correct option)
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Answer:
Correct Answer: 6. (b, d)
Solution:
- As, $a=\frac{F}{m}=\frac{5 \times 10^{4}}{3 \times 10^{7}}=\frac{5}{3} \times 10^{-3} m / s^{2}$
So, $v=\sqrt{2 a s}=\sqrt{2 \times \frac{5}{3} \times 10^{-3} \times 3}=0.1 m / s$
