Question

Cumulative Problem 1 A 150.0-kg crate rests in the bed of a truck that slows from 56.0 km/h to a stop in 12.0 s. The coefficient of static friction between the crate and the truck bed is 0.675. 1) Will the crate slide during the braking period? The crate will slide during the braking period. The crate will not slide during the braking period. Submit 2) What is the minimum stopping time for the truck in order to prevent the crate from sliding (Express your answer to two significant figures.) 2.35I S Submit Your submissions: 2.35 Computed value: 2.35 Feedback: X Submitted: Wednesday, November 20 at 11:03 PM

Answer 1

m = 150 kg u-56 kmlhe-> 15.555 ml r -o t = 12 see v=utat o=is.555+ a 12) sa=(1.296] m/s² Errate - tma = - 150 x 1.296 5-194.44 N Ffaction = -ling =-6.675 150498 -99 2.250 .: It will not slide

(b) Now Fearate = 992 25= ma +992:25 = 150 a ga= -6.615 v=utat 0=15.55-6-615t +=(2.35 sec = (2-4 seconds