Question

a bus takes 2 hours to cover a distance of 72 km calculate its speed in km/h and m/s ​

Answer 1

$\underline{\fcolorbox{red}{pink}{ \huge{Solution :)}}}$

Given ,

Time = 2 hr = 120 sec

Distance = 72 km = 72000 m

{1 hr = 60 sec & 1 km = 1000 m }

We know that , the relationship between speed , time and distance is given by

$\star \: \large \sf \fbox{Speed = \frac{distance}{time} }$

Speed in term of km/hr

$\sf \mapsto Speed = \frac{72}{2} \\ \\ \sf \mapsto Speed = 36 \: \: km/h$

Speed in term of m/sec

$\sf \mapsto Speed = \frac{72000}{120} \\ \\ \sf \mapsto Speed = 600 \: \: m/sec$

Hence , the speed of bus is 36 km/hr or 600 m/sec

_____________ Keep Smiling :)

Answer 2

Answer:

72 km /h =20m/s

by base equal of uniform motion

v ^ 2=u^2+ 2as

v =final velocity (which is zero in the case )

u=intial velocity (20 m/s)

s=50m

a=3m/s^2

then by others equal

v=u+at

t=5s

- ve means opposite to motion .