A motorboat traveling on a straight coures slows uniformlyfrom 60 to 40 km/h in

Question

A motorboat traveling on a straight coures slows uniformlyfrom 60 to 40 km/h in a distance of 50m. What is the boatsacceleration? Texk book answer is Initial velocity for 60km/h = 16.68ms andFinal velocity is 40km/h = 11.12m/s I'm guessing avg boats acceleration? 16.68 + 11.12 / 2 =13.9 m/s Is this correct? A motorboat traveling on a straight coures slows uniformlyfrom 60 to 40 km/h in a distance of 50m. What is the boatsacceleration? Texk book answer is Initial velocity for 60km/h = 16.68ms andFinal velocity is 40km/h = 11.12m/s I'm guessing avg boats acceleration? 16.68 + 11.12 / 2 =13.9 m/s Is this correct?

Explanation / Answer

Use the equation V2-Vo2=2ax, soa=(V2-Vo2)/(2x)= -.6956m/s2. The acceleration is negative because the boat isslowing down, so the sign should be negative.

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