Question

speed of the body?
3. A speed skier registers an average speed of 233.7 km/h
over a distance of one kilometre.
(a) How long did he take to cover the kilometre?
(b) Express his average speed in ms-1.

Answer 1

★★Question:-

A speed skier registers an average speed of 233.7 km/h over a distance of one kilometre.

• How long did he take to cover the kilometre?
• Express his average speed in ms-1.

★★Given;-

• Speed =233.7 km/hr
• Distance that he has to travel= 1 km
• so, distance = 1 km

★★Answer;-

(a) we know that,

$Time =\frac{Distance}{Speed}$

$=\frac{1}{233.7}$

$= 0.00427\:hr$

$=0.00427×3600$

$\boxed{\boxed{{Time=15.372\: sec}}}$

(b) Speed is given as $233.7 km/hr$

We have to convert this into m/sec

We know that $1 km = 1000 m$

And 1 hour$= 3600 sec$

so,

$233.7km/hr=\frac{233.7\times 1000}{3600}$

$\boxed{\boxed{{Average\:speed=6.4916m/sec}}}$