Question

5.

The speed of a car on a straight road is 54 km/hr. Find the time in which he

can cover a distance of 200m.
​

Answer 1

Answer:

Initial velocity u=126 km/h=126×

18

5

=35 m/s

Final velocity v=0 m/s

Distance covered S=200 m

Using v

2

−u

2

=2aS

Or 0−(35)

2

=2×a×(200)

⟹ a=−3 m/s

2

Using v=u+at

Or 0=35+(−3)t

⟹ t=11.67 s

Answer 2

Given,

• Speed of car =54 km/hr = 15 m/s

• Distance covered = 200 m

To find :

• Time taken to cover a dostance of 200 m

Solution :

We know that,

$\boxed{ \sf \: distance = speed \times time}$

$\sf \: time \: taken = \frac{distance}{speed }$

time taken = 200/15 = 13.3 s