Question

What will be ratio of speed in first two seconds to the speed in next $4\,s$ ?

• A. $\sqrt{2}:1$
• B. $3:1$
• C. $2:1$
• D. $1:2$

Answer 1

Answer: (C)

$2:1$

Answer 2

$v=\frac{\text { Distance }}{\text { Time taken }}$ As shown in given figure $\frac{v_{1}}{v_{2}}=\frac{\frac{s_{0}}{t_{1}}}{\frac{s_{0}}{t_{2}}}=\frac{s_{0}}{t_{1}} \times \frac{t_{2}}{s_{0}}$ $\frac{v_{1}}{v_{2}}=\frac{4}{2}=\frac{2}{1}$ Therefore, the ratio of speeds is $v_{1}: v_{2}=2: 1$