Question

a racers starts her cars from rest and accelerates at 10 metre per second square for entire distance of 400 metre how long did it take the reason to travel this distance and what is the speed of the car at the end of the race​

Answer 1

Answer:

Speed = 90 m/s (approx)

Time = 9 sec

Explanation ;-

GIVEN :-

Initial speed = 0 m/s

Acceleration = 10 m/s

Distance = 400 m

we know that ,

2*a*s = v^2 - u^2

20*400 = v^2

v = √ 8000

v = 89.44 = 90 m/s ( approx)

Also ,

v = u + a*t

90 = 10*t

t = 9 sec

_________NOTE_________

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Answer 2

Explanation:

Answer is

9.01 is the correct answer