19. A car covers 90 km in 1 and half hours towards east. Calculate (i), displacement of car, (ii) its velocity in (a)
kmh (b) ms
Answers
Answer:
Explanation:
(i) Displacement of the car = 90 km (Because its moving towards east (i.e, specified in particular direction . so,therefore the distance travelled in a particular direction is also called displacement)
(ii) (a)
Displacement (s) = 90 km
Time (t) = 1hr 30 mins = 1.5 hrs
Velocity (in km/h) = ?
We know that , velocity (v) = Displacement(s)/Time(t)
=> v = s/t
=> v = 90/1.5 km/hr
=> v = 60 km/hr
(b) Velocity (in m/s) = ?
To find the Velocity (in m/s) , we have to convert it from Velocity (in km/h).
so, 1km/h = 1000 m/3600 secs
=> 1km/h = 5/18 m/secs ( cancelling 1000/3600,we get 5/18. If you want to convert km/h into m/s,just multiply with 5/18.If you want to convert m/s into km/h then just multiply the value with 18/5 , Its time saving hack!)
Then, 60 km/hr = 60 x 5/18 m/s
=> 60 km/hr = 16.66.... m/s
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