1.

Mohit is driving along a straight highway with a uniform speed of 80 km/h. What is his velocity? Justifyyour answer.

Answer»

Answer:

A

3.06m/s

2

and 11.4s

Given,

Velocity of car V=126 km/h=35 m/s

Displacement s=200 m

Final velocity v=0 m/s

Apply SECOND kinematic equation to calculate retardation a

v

2

−u

2

=2as

⇒a=

2s

v

2

−u

2

=

2×200

0−35

2

=−3.0625 m/s

2

Apply FIRST kinematic equation to calculate time t

v=u+at

⇒t=

a

v−u

=

3.0625

0−35

=11.43 sec

HENCE, retardation is 3.06 m/s

2

and time take to stop is 11.4 sec



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