A woman throws a baseball from the front of an airplane to the back. From the perspective of the woman, the baseball travels at an average speed of 15 m/s. To an observer on the ground, the airplane is traveling at a constant speed of 820 km/h. What is the speed of the baseball from the perspective of the ground observer?

Question

anonymous · Answer

So for these questions, you add if they're going in the same direction and you subtract if it's in the opposite direction

for the ground observer, since the ball is moving in the opposite direction of the plane, it would be

820 km/h - 15 m/s

15 m/s * 60 s/min * 60 min/hour = 54000 m/h, 54000 m/h * 1000 m/km = 54 km/h

820 km/h - 54 km/h = 768 km/h to the ground observer

By the way, I don't think it's safe for someone to throw a baseball that fast in an airplane

anonymous · Answer

the choices are 228 m/s
	243 m/s
	213 m/s
	840 m/s

roadjester · Answer

I have to agree with @greenleaf800073 's analysis. 768km/hr is an option

anonymous · Answer

how do you convert from Km/hr to m/s?

roadjester · Answer

There are 1000m in a km
60 min in an hour
60s in a minute.

roadjester · Answer

What did you get?

anonymous · Answer

228 i think idk haha

roadjester · Answer

...

roadjester · Answer

768 $\dfrac {km}{hr}$ X $\dfrac {1000m}{km}$ X $\dfrac {1hr}{3600s}$=?

anonymous · Answer

213.3

roadjester · Answer

$\huge ☺$

anonymous · Answer

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