Ronald drives along a mountain and enters a tunnel with a speed of 30m/s, suddenly he realizes that 155m in front of him is a truck going at 5m/s. Ronald's acceleration is 2m/s^2. how long will it take before he hits the car?

Question

anonymous · Answer

@rajathsbhat  @hartnn  @ajprincess  @experimentX

anonymous · Answer

these are the things that i know:

anonymous · Answer

a= 2m/s^2 s=155m relative v= 25m/s

anonymous · Answer

the question might not be grammatically correct because i had to translate from Dutch.. :/

anonymous · Answer

155 + 30t + t^2 = 5t

t^2 +25t + 155 =0

Solve for t

anonymous · Answer

ah thx!

anonymous · Answer

but why is it 30?

anonymous · Answer

Distance covered by ronald = Distance Covered By Truck

$$S = ut + \frac{ 1 }{ 2 }at^2$$

anonymous · Answer

sorry, i didn't see that it was 25..

anonymous · Answer

S = u*t

anonymous · Answer

truck isn't accl right?

anonymous · Answer

yes :) i got the answer 11,4s