Question

A car of mass 1metric ton starts from cost and accelerates to a speed of 72km/h in 20 sec . It then moves with a constant velocity for 80 sec , and is brought to rest in next 10 ten sec


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Answer 1

Answer:

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Explanation:

Given,

Mass of car, M=2000kg

Velocity, V=72×

18

5

=20ms

−1

Apply kinematic equation of motion

v

2

−u

2

=2as

0−20

2

=2a×20

a=−10ms

−2

Breaking force, F=ma=2000×10=20 kN

Apply first kinematic equation

v=u+at

t=

a

v−u

=

−10

0−20

=2 sec

Breaking force is 20 kNand time is 2sec.

Answer 2

Answer:

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