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Two balls, A and B are thrown simultaneously, A vertically upward with a speed of 20 ~m / s from the ground and B vertically downward from a height of 40 m with the same speed and along the same line of motion. At what points do the two balls collide by taking acceleration due to gravity as 9.8 ~m / s ^2 ?

Options

  1. AThe balls will collide after 3 s at a height of 30.2 m from the ground
  2. BThe balls will collide after 2 s at a height of 20.1 m from the ground.
  3. CThe balls will collide after 1 s at a height of 15.1 m from the ground
  4. DThe balls will collide after 5 s at a height of 20 m from the ground

Correct answer

C. The balls will collide after 1 s at a height of 15.1 m from the ground

Step-by-step solution

The correct answer is option (C)

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