Question 2 of 13 Sapling Learning An initially motionless test car is accelerate

Question

Question 2 of 13 Sapling Learning An initially motionless test car is accelerated uniformly to 135 km/h in 8.08 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.935 seconds, after which the car is measured to be traveling at 71.0 km/h. What is the magnitude of the acceleration of the car before the collision? Number m s What is the magnitude of the average acceleration of the car during the colision? Number m/s What is the magnitude of the average acceleration of the car during the entire test, from when the car first begins moving until the collision is over? Number m/ s Hint Previous & Give Up &Vew Solution Check Answer Next Exit

Explanation / Answer

Here, before the collision

initial speed = 0 m/s

final speed , v = 135 km/hr = 37.5 m/s

magnitude of acceleration = (v - u)/t

magnitude of acceleration = (37.5 - 0)/8.08

magnitude of acceleration = 4.64 m/s^2

for the duration of collision

initial speed = 37.5 m/s

final speed , v = 71 km/hr = 19.72 m/s

magnitude of acceleration = (37.5 - 19.72)/.935

magnitude of acceleration = 19.01 m/s^2

for the average acceleration

magnitude of acceleration = (19.72 - 0)/(8.08 + 0.935)

magnitude of acceleration = 2.19 m/s^2

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