question_answer

A force of 10 kgwt acting on a certain mass for 2 seconds gave it a velocity of 10 m/s. What is the mass in kg? \[(\text{g}=\text{9}.\text{8m}/{{\text{s}}^{\text{2}}})\]

Answer:

\[F=10kg.\,\,wt=10\times 9.0N=98N\] \[t=2s,\,\,v=10m/s;\,\,m=?\] Now \[a=\frac{v}{t}=\frac{10}{2}=5m/{{s}^{2}}\] \[\therefore m=\frac{F}{a}=\frac{98}{5}kg=19.6kg\]