Question

16.
A car starts from rest and attains a velocity of 10 m/s in 40s. The driver applies Brakes and
slows down the car to 5 m/s in 10s. What is the acceleration of the car in both the cases?
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Answer 1

Answer:

hello

here is your answer

Answer 2

Answer:

0.25 m/s²

- 0.5 m/s²

______________________

Explanation:

We know that,

Acceleration = {final speed(v) - initial speed(u)}/ time taken (t)

Let there be Two Cases.

CASE I

When the car starts from rest

initial speed (u) = 0

Final speed (v) = 10 m/s

Time taken (t) = 40s

Acceleration = {final speed(v) - initial speed(u)}/ time taken (t)

= (10 - 0)/ 40

= 10/ 40

= 1/ 4

= 0.25 m/s²

- - - - - - - - - - - - - - - - - -

CASE II

When the brakes are applied:

initial speed (u) = 10 m/s

Final speed (v) = 5 m/s

Time taken (t) = 10s

Acceleration = {final speed(v) - initial speed(u)}/ time taken (t)

= (5 - 10)/ 10

= -5/ 10

= - 1/ 2

= - 0.5 m/s²

______________

Hope this helps!