Question

30. A body of mass 2 kg has an initial speed 5 ms-1.
A force acts on it for some time in the direction of
motion. The force-time graph is shown in figure. The
final speed of the body is :-

(1) 9.25 ms-1
(3) 14.3 ms-1
(2) 5 ms -1
(4) 4.25 ms-1​

Answer 1

Answer:

know,

Area under force-time graph = change in linear momentum

∴ΔP=

2

1

×2×4+(4−2)×4+(4.5−4)×2.5+

2

1

×(4.5−4)(4−2.5)+(6.5−4.5)×2.5

∴P

f

−P

i

=18.625

Now,

P

i

=m×v

i

=2×5=10kgm/s

∴P

f

=10+18.625

∴P

f

=28.625kgms

−1

∴v

f

=14.3125m/s

Explanation:

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Answer 2

Answer:

14.3125 m/s

Explanation:

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