Two bullets are fired horizontally and simultaneously towards each other from roof tops of two buildings 100 m apart and of the same height of 200 m, each with speed 25 m s⁻¹. When and where will the two bullets collide? (g = 10 m s⁻²)
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Question

Two bullets are fired horizontally and simultaneously towards each other from roof tops of two buildings 100 m apart and of the same height of 200 m, each with speed 25 m s⁻¹. When and where will the two bullets collide? (g = 10 m s⁻²)

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G1 Physics · Accepted Answer

Step 1: Horizontal closing speed =25+25=50 m s⁻¹, so collision time t=100/50=2 s. Step 2: In 2 s each bullet falls y=½gt²=½×10×4=20 m. Step 3: The collision height above ground is 200−20=180 m. Final answer: A.