Question

a car is travelling in a straight line at 25 ms-1. The car brakes for 5.0 s and the speed is reduced uniformly to 15 ms-1. How far does the car travel in this time?​

Answer 1

Answer:

acceleration= (v-u)/t

                   =(15-25)/5

                     = -10/5

                     =-2m/s^2

v^2=u^2 +2aS

625=225+2*-2*s

400/-4= S

-100m =S

the car travells 100 meters in that time

Explanation:

Answer 2

Answer:

56.25 Metre

Explanation:

Initial Velocity = 25 m/s

Final Velocity = 15 m/s

Time = 5 s

Therefore,

Retardation = (v-u)/t

=( 15-25 )/5

= -2

= 2

Let d be the distance travelled,

We Know,

v²-u² = 2 aS

=> 15²=2.2.d

=> 225÷4 = d

=> d = 56.25