Question

Starting from a stationary position, a car attains a velocity of 5 / in 20 . Then, the driver of the car applies a brake such that the velocity of the car comes down to 3 / in the next 6 . Calculate the acceleration of the car in both the cases.

Answer 1

Answer:

ANSWER

For first case:

Initial velocity =0

Final velocity =60m/s

Time =30sec

v=u+at

6=0+a×30

6=30a

a=

30

6

=0.2

a=0.2m/s

2

For second case:

Initial velocity =6m/s

Final velocity =4m/s

Time taken =5sec

v=u+at

4=6+a×5

4−6=5a

−2=5a

a=−

5

2

a=−0.4m/s

2