A Train Starts from Rest and Accelerates Uniformly Until It $42 \mathrm {~m} / \mathrm { s }$

question 27

Multiple Choice

A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of $42 \mathrm {~m} / \mathrm { s }$ The train then moves at a constant velocity of $42 \mathrm {~m} / \mathrm { s }$ for 420 s. The train then slows down uniformly at $0.065 \mathrm {~m} / \mathrm { s } ^ { 2 }$ until it is brought to a halt. The acceleration during the first 5.6 km of travel is closest to which of the following?

• A)0.16 m/ \(\mathrm { s } ^ { 2 }\)
• B)0.14 m/ \(\mathrm { s } ^ { 2 }\)
• C)0.17 m/ \(\mathrm { s } ^ { 2 }\)
• D)0.19 m/ \(\mathrm { s } ^ { 2 }\)
• E)0.20 m/ \(\mathrm { s } ^ { 2 }\)

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