A car is traveling at 56km/hr and is 24m away from a wall whenthe driver slams o

Question

A car is traveling at 56km/hr and is 24m away from a wall whenthe driver slams on the brakes. The car hits the wall 2.19seconds later. what was the car's constantdeceleration (in m/s^2) before the impact, and how fast is thecar traveling (in m/s) at impact? Your help is much appreciated, I will rate asap. A car is traveling at 56km/hr and is 24m away from a wall whenthe driver slams on the brakes. The car hits the wall 2.19seconds later. what was the car's constantdeceleration (in m/s^2) before the impact, and how fast is thecar traveling (in m/s) at impact? Your help is much appreciated, I will rate asap.

Explanation / Answer

Initial speed u = 56 km / h                       = 56 * ( 5/ 18 ) m / s= 15.5555 m / s distance S = 24 m time interval t = 2.19 s we know S = ut + ( 1/ 2) at ^ 2 from this ( 1/ 2) a t ^ 2 = S - ut                                   = -10.065 from this deceleration a = -4.197 m / s ^ 2 here -ve indicates deceleration (b). Let the speed at impact be v then v ^ 2 - u ^ 2= 2aS                      v = [ u ^ 2 + 2aS ]                         = 6.362 m / s                   

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