Question

8.
If a particle covers 10 m in 2 s, then the average
speed of particle is
(1) 36 km/h
(2) 18 km/h
(3) 72 km/h
(4) 5 km/h​

Answer 1

$\huge\underline\green{\sf Answer}$

★$\large{\boxed{\sf Average\:Speed=18km/h}}$

$\huge\underline\green{\sf Solution}$

Given :-

Distance (s)= 10m

Time(t) = 2s

Average speed $\sf{V_{av}}$ = ?

FORMULA TO FIND AVERAGE SPEED :-

★$\large{\boxed{\sf V_{av} ={\frac{Distance}{Time}}}}$

ON PUTTING VALUE :-

$\large\implies{\sf {\frac{10}{2}}}$

★$\large{\boxed{\sf V_{av}=5m/s}}$

CONVERT IT m/s INTO km/hr

To convert m/s in km/hr just multiply it by $\sf{\frac{18}{5}}$

$\large{\sf V_{av}= 5 \times {\frac{18}{5}}}$

★$\huge\red{\boxed{\sf V_{av}=18 km/hr}}$

Answer 2

$\large \bold{ \underline{ \underline{ \: Answer : \: \: \: }}}$

$\to$ Average speed = 18 km/hr

$\large \bold{ \underline{ \underline{ \: Explaination : \: \: \: }}}$

Given ,

$\huge{ \star}$ Distance = 10 m = 0.01 km

$\huge{ \star}$ Time = 2 sec = 0.00055 hr

$\large \fbox{ \fbox{ \bold{ \: \: Average \: speed = \frac{Distance}{Time } \: \: }}}$

$\to$ Average speed = 0.01/0.00055

$\to$ Average speed = 18.18181 km/hr

Hence , correct option is ( B )