If a bullet is fired downward with initial velocity 200 m/s from a height of 150

Question

If a bullet is fired downward with initial velocity 200 m/s from a height of 150 m, how much time will elapse before the bullet strikes the ground? What is the speed of the bullet just before it hits the ground? Assume air resistance is negligible. 15. time a. 0.7367s b. 0.9088 s c. 0.8782s d. 0.8875 s e 0.6781s f. 0.8659 s 16. speed a. 164.5 m/s b. 239.7 m/s c. 164.1 m/s d. 207.2 m/s e. 244.7 m/s f. 170.9 m/s A ball dropped from a helicopter takes 1.4 s to fall the final 40 m. From what height was it dropped? a. 69.86 m b. 71.46 m c. 64.05 m d. 77.91 m e. 52.38 m f. 56.18m

Explanation / Answer

15) from the equation

y = ut+1/2gt^2

-150 = 200*t+1/2*9.8*t^2

4.9t^2+200t-150 = 0

t = 0.7367 sec

16) v = u+at

v = 200+9.8*0.7367 = 207.2 m/s

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