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Question

A constant force acting on a body of mass of 5kg change its speed from 5 ms1 to 10 ms1 in 10 s without changing the direction of motion. The force acting on the body is

A
1.5 N
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B
2 N
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C
2.5 N
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D
5 n
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Solution

The correct option is C 2.5 N
Here, m=5 kg, u=5 ms1, v=10 ms1, t= 10s
Using v=u+at
a=vut=(105)ms110s=0.5ms2
As F=ma
F=(5kg)(0.5ms2)=2.5N

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