A force of 100 dynes acts on mass of 5 gm for 10 sec. The velocity produced is

(A) 2 cm/sec
(B) 20 cm/sec
(C) 200 cm/sec
(D) 2000 cm/sec
Correct answer: (C) 200 cm/sec
Given,
Force (F) = 100 dynes
Mass (m) = 5 g
Time (t) = 10 sec
As the body starts from rest, the initial velocity (u) = 0 m/s
Acceleration (a) = F/m = (100 × 10-5)/(5 × 10-3) = 0.20 = 20 cm/s2
Using the relation v = u + at
v = 0 + 20 × 10 = 200 cm/sec

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