Question

A force of $100 \, dyne$ acts on a mass of $5 \, g$ for $10 \, s$ . The velocity produced is

• A. $2cms^{- 1}$
• B. $20cms^{- 1}$
• C. $200cms^{- 1}$
• D. $2000cms^{- 1}$

Answer 1

Answer: (C)

Given,
$F=100 \, dyne$
$m=5 \, gram$
$t=10 \, second$
Acceleration $a=\frac{F}{m}=\frac{100}{5}=20cm/s^{2}$
Now from equation of motion
$v=u+at$
$v=0+20\times 10$
$v=200cm/s$