Question

Albert is riding his scooter at a velocity of $80km/h$ when he sees an old woman crossing the road $45m$ away he immediately steps hard on the break to get the maximum deceleration of $7.5m/s^2$ . How far will he go before stopping, will he hit the old woman? (in m)

• A. $36.4,Yes$
  
• B. $35,No$
  
• C. $54.2,Yes$
  
• D. $32.9,No$
  

Answer 1

The correct option is D $32.9,No$

Initial speed=u=22.22 m/s

Final speed=v=0 m/s

Acceleration =a= $-7.5m/s^2$

Distance travelled before stopping=$(v^2-u^2)/2\times a={22.22}^2/15=32.9m<45m$

Hence correct answer is option $D$