Question

a car is moving in a straight line at a speed of 18km/h what is retardation and speed after 2s of applying brake?​

Answer 1

Explanation:

u=18

v=0

t=2

a=v-u/t

0-2/2

-1m/sec^2 is the acceleration

1m/sec^2 is the retardation

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Answer 2

ANSWER

Given, Speed=18km/h,t=5s

a)The speed of the car in m/s=18×

18

5

=5 m/s

b) The retardation is:

a=

t

v−u

=

5

0−5

=1m/s

2

c) The velocity of the as a funcition of time 2sis:

v(t)=5−t⇒v(t)=5−2=3m/s=10.8 km/h

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