Question

A block of mass $2$kg place on a long friction less horizontal table is pulled horizontally by a constant force F. It is found to move $10$m in first two seconds. Find the magnitude of F.

• A. $20N$
• B. $10N$
• C. $0.5N$
• D. $40N$

Answer 1

The correct option is B $10N$

$\begin{array}{c}Giventhatm=2kg\\ Displacement\left(s\right)=10m\\ Time\left(t\right)=2S\\ u=0m{s}^{-1}\\ s=ut+\frac{1}{2}a{t}^2\\ 10=0\times 2+\frac{4}{2}a\\ a=5m/s^2\\ F=ma=2\times 5=10N\end{array}$