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Question

A ship of mass 3×107kg initially at rest is pulled by a force of 5×104N through a distance of 3 m. Assuming that the resistance due to water is negligible, what will be the speed of the ship?

A
0.1 m/s
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B
1.5 m/s
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C
5 m/s
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D
0.2 m/s
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Solution

The correct option is A 0.1 m/s
Given,

m=3×107kg

S=3m

u=0m/s

F=5×104N

Newton 2nd law,

F=ma

a=Fm=5×1043×107

a=1.66×103m/s2

Kinematics 2nd equation of motion,

2as=v2u2

2×3×1.66×103=v2

v=0.1m/s

The correct option is A.

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