Question

1. A car starts from rest and accelerated at the rate of 2 m/s in a straight line untill it reacjes a speed of 20 m/s. The car then slows at constant rate of 1 m/s until it stops. How much time taken from start to stop
(A) 10 S
(B) 20 S
(C) 30 S
(D) 50 S
Ans is C i just want a solution of it .​

Answer 1

Answer:

u search in google u will get correct answer

Answer 2

V

avg

=

time

distance

Let the total time be t.

Average speed for 1st interval of

4

t

is

2

v

For 1st interval, s

1

=

2

v

×

2

t

Average speed for 3rd interval of

4

t

is

2

v

For 3rd interval, s

3

=

2

v

×

2

t

For 2nd interval, s

2

=v×

2

t

Total distance d=s

1

+s

2

+s

3

Total time is t

v

avg

=

t

d

=

4

3v