16) If a projectil about e is fired straight up at a speed of 10 m/s, the time i

Question

16) If a projectil about e is fired straight up at a speed of 10 m/s, the time it takes to reach the top A) 2 seconds. C) 10 seconds. B) 1 second. D) not enough information to estimate 17) In each second of fall, the distance a freely falling object will tall is 1T A) about 10 m. B) about 5 m. C) increasing. D) the same, but not 5 m or 10 m. E) none of these 15) second. One second later 18) At one instant an object in free fall is moving downward at 50 meters per its speed should be about E) 55 m/s D) 100 m/s. A) 50 m/s. B) 25 m/s. C) 60 m/s. 19) 19) An airplane that flies at 100 km/h in a 100-km/h crosswind has a ground speed of B) 141 km/h D) 100 km/h C) 200 km/h A) 0 km/h C) 70 km/h 20) An 80-km/h airplane flying against a 10 km/h head wind has a ground speed of B) 80 km/h A) 90 km/h D) none of these

Explanation / Answer

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16.

From

Y=Yo+Voyt -(1/2)gt2

0 =0+10t -(1/2)*10t2

10 =5t

t=2 s

17.

Increasing

18.

From

V=Vo+at =50+10*1

V=60 m/s

19.

V=sqrt[1002+1002]=141 km/h

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