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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/s2?

Options

A.The balls will collide after 3s at a height of 30.2 m from the ground
B.The balls will collide after 2s at a height of 20.1 m from the ground
C.The balls will collide after 1s at a height of 15.1 m from the ground
D.The balls will collide after 5s at a height of 20 m from the ground

Correct Answer

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

Exam
NDA
Language
English
Year
2016
Difficulty
1/5
Section
General Ability Test

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