Question

16
Two particles move under gravity starting at the same point with initial horizontal speed: 3m/s and 4m/s in
opposite direction. Their velocities will be perpendicular to each other after time................econds. Separation
between the two particles at this moment is............... meter.
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Answer 1

Answer:

Explanation: For velocities to be perpendicular, make their dot product=0

(-3i-10tj)(4i-10tj)=0

-12+100t^2=0

t=√3/25s

Thank you!