Question

Two particles move along $x$ axis in the same direction with uniform velocities $8m/s$ and $4m/s$. Initially the first particle is $21m$ to the left of the origin and the second one is $7m$ to the right of the origin. The two particles meet from the origin at a distance of

• A. $35m$
• B. $32m$
• C. $28m$
• D. $56m$

Answer 1

The correct option is A $35m$

Relative velocity $=8-4=4m/s$
Relative distance $=28m$
So, time $=\frac{28}{4}=7sec$
Distance by (2) in 7 secs $=4\times 7=28m$
So, they meet at $(7+28,0)=(35,0)$