Work Energy and Power - Result Question 44

47. Two bullets are fired horizontally and simultaneously towards each other from roof tops of two buildings 100m apart of same height of 200m, with the same velocity of 25 m/s. When and where will the two bullets collide? (g=10m/s2) [NEET Odisha 2019]

(a) They will not collide

(b) After 2s at a height of 180m

(c) After 2s at a height of 20m

(d) After 4s at a height of 120m

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Answer:

Correct Answer: 47. (b)

Solution:

  1. (b)

Bullets collide at time t

x1+x2=100m

25t+25t=100

t=2sy=12gt2=12×10×22=20mh=20020=180m



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