IP A boat is cruising in a straight line at a constant speed of 2.2m/s when it i

Question

IP A boat is cruising in a straight line at a constant speed of 2.2m/s when it is shifted into neutral. After coasting 12m the engine is engaged again, and the boat resumes cruising at the reduced constant speed of 1.2m/s .

Part A

Assuming constant acceleration while coasting, how long did it take for the boat to coast the 12m ?

Express your answer using two significant figures

Part B

What was the boat's acceleration while it was coasting?

Express your answer using two significant figures.

Part C

When the boat had coasted for 6.0m , was its speed 1.7m/s , more than 1.7m/s , or less than 1.7m/s?

When the boat had coasted for 6.0 , was its speed 1.7 , more than 1.7 , or less than 1.7 ?

Explanation / Answer

(final velociy)2=(initial velociy)2+2as

(1.2)2=(2.2)2+2a(12)

a=-0.1416m/s2

v=u+at

1.2=2.2+(-0.1416)t

t=7.062sec

v2=u2+2as=(2.2)2+2(-0.1416)6=3.1408

v=1.7722 m/s:; speed is more then 1.7m/s

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