Let's do Kinematics!
Classical Mechanics
Level
2
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?
15.1 m from the top(40m above ground) after 3s
17.3 m from ground after 2s
15.1 m from ground after 1s
16.5 m from the top(40m above ground) after 2s
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1 solution
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.