Math, asked by sivamthapa2731, 5 days ago

A car is travelling at 10mps, when the driver stepped on the brake and stopped the car at a distance of 100meters. Is the time to stop the car equal to 15 secs ?

Answers

Answered by Anonymous
0

Answer:

No, the time to stop the car is not 15sec its 20 sec.

Step-by-step explanation:

We are given that,

Initial velocity (u) = 10m/s ;

final velocity (v) = 0m/s (since the car stops)

Distance coverd (s) = 100m

To check whether time (t) = 15s ?

Using 3rd equation of motion

v²-u²= 2as we get a= v²-u²/2s

therefore a= 0²-(10)²/2×100= -100/200= -1/2m/s²

= -0.5m/s²

now using first equation of motion we get,

v=u + at which on rearranging gives us

t=v-u/a

therefore, t = 0-10/-0.5= 10/0.5 =20 sec

Hence the time to stop the car is 20 sec not 15 sec.

Similar questions