Question

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

Answer 1

Answer: (C)

Given that,

Force $F=100dyn$

Mass $m=5g$

Time $t=10s$

Initial velocity $u=0$

Now, the acceleration is

$F=ma$

$a=\frac{F}{m}$

$a=\frac{100\times {10}^{-5}}{5\times {10}^{-3}}$

$a=0.20m/s^2$

Now, from equation of motion

$v=u+at$

$v=0+0.20\times 10$

$v=2m/s$

$v=200cm/s$

Hence, the velocity produced is $200cm/s$