To Maintain an Automobile in Approximately Constant Acceleration, Its Engine $\times$

question 7

Multiple Choice

To maintain an automobile in approximately constant acceleration, its engine must develop power that increases with time. Suppose that in one situation the work done by an engine is given by
W = 7000t² + 40,000t + 100,000
Where the units are SI. The power developed by this engine at t = 2 s is

• A) 3.4 \(\times\) 10⁴ W
• B) 6.8 \(\times\) 10⁴ W
• C) 1.0 \(\times\) 10⁵ W
• D) 2.1 \(\times\) 10⁵ W
• E) 3.0 \(\times\) 10⁵ W