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Question

A particle starts with a velocity 2m/sec and moves on a straight-line track with retardation 0.1 m/sec2. The time at which the particles is 15 m from the starting point would be

A
10 sec
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B
20 sec
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C
50 sec
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D
40 sec
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Solution

The correct option is A 10 sec
v2=u2+2as

=42(2×0.1×15)

=43=1

v=1 m/sec

v=u+at

1=2+(0.1×t)

t=10 sec

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