Two bodies A and B are thrown simultaneously. A is projected vertically upwards with 20 m/s speed from ground and B is projected vertically downwards from a height of 40 m with the same speed and along the same line of motion. At what point do bodies collide?
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The relative acceleration between the two bodies is always zero. So we can apply the concept of relative velocity here. The relative velocity between the two bodies is always 40 m/s (Adding both the velocities). So, from s=ut | 40=40t therefore t=1 sec. The only option that have that value is d.