Chapter 6, Problem 14MCQ

a.

To determine

Speed of the men who make Olympic record in m/s

Answer to Problem 14MCQ

Speed of the men in m/s is 2.828 m/s.

Explanation of Solution

Given:

Distance covered by men is, $d=50\text{ m}$

Time taken to cover the distance is, $t=21.91\text{ s}$

Speed is given by ratio of distance covered and time taken to cover the distance.

Therefore, $s=\frac{d}{t}$

Where, s is speed, d is distance and t is time.

Now, substituting the value of d and t and solve.

  $\begin{array}{l}s=\frac{50}{21.91}\\ =2.282\text{ m/s}\end{array}$

Therefore, speed of the men in m/s is 2.828 m/s.

b.

To determine

Distance swum by men at the rate of 2.822 m/s in meter.

Answer to Problem 14MCQ

Distance swum by men is 136.92 m

Explanation of Solution

Given:

Time is given, $t=1\text{ min =60 s}$

From part (a) speed of the men is $s=2.282\text{ m/s}$

Distance covered is given by,

  $d=s\times t$

Where, d is distance, s is speed and t Is time.

Now, substituting the value of s and t and solve.

  $\begin{array}{l}d=2.282\times 60\\ =136.92\text{ m}\end{array}$

Therefore, distance swum by men is 136.92 m