question_answer

A force of 200 dyne acts on a body of mass 10 g for 5 sec. What will be the final velocity of the body if it starts from rest?

Answer:

\[F=200\,\,dyne,\,\,m=10g,\,\,t=5s\]  \[\therefore \,\,a=\frac{F}{m}=\frac{200}{10}=20cm/{{s}^{2}}\] As a body starts from rest, \[u=0\] From 1st equation of motion \[v=u+at\Rightarrow v=at\] \[\Rightarrow v=20\times 5cm/{{s}^{2}}=100\,\,cm/s\]