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Q.

A constant force acting on a body of mass of 5 kg change its speed from 5 ms-1 to 10 ms-1 in 10 s without changing the direction of motion. The force acting on the body is

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a

2.5 N

b

5 N

c

1.5 N

d

2 N

answer is C.

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Detailed Solution

detailed_solution_thumbnail

Here, m = 5 kg,  u = 5 ms-1, v = 10 ms-1, t = 10 s

Using v = u+at

a = v-ut  = (10-5) ms-110s = 0.5 ms-2

As F = ma

F = (5 kg)(0.5 ms-2) = 2.5 N

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