nment PULL SCREN PRINTER VERSION BACK NEX Chapter 02, Problem x12 A speedboat st

Question

nment PULL SCREN PRINTER VERSION BACK NEX Chapter 02, Problem x12 A speedboat starts from rest and accelerates at +2.24 m/s2 for 5.93s. At the end of this time, the boat continues for an additional 6.77 s with an acceleration of +0.529 m/s2. Following this, the boat accelerates at -1.18 m/s2 for 8.30 s. (a) What is the velocity of the boat at t-21.00 s? (b) Find the total displacement of the boat r3 (a) Number Units (b) Number Units SAVE FOR LATER Question Attempts: Unlimited cy2000-2017 John.iley &.Sons.Inc All Rights Reserved. A Division of John wiley & Sons.Jnc

Explanation / Answer

a] using first equation of motion,

v = a1t1 +a2t2 +a3t3

= 2.24*5.93 + 0.529*6.77 - 1.28*8.30

= 6.24053 m/s answer

b] total displacement = x1+x2+x3

= v1^2/2a1 +(v2^2-v1^2)/2a2 + (v^2-v2^2)/2a3

= [2.24*5.93]^2/(2*2.24) + [(2.24*5.93 + 0.529*6.77)^2 - (2.24*5.93)^2]/(2*0.529) + [6.24053^2 - (2.24*5.93 + 0.529*6.77)^2]/(-1.28)

= 333 m answer

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