A ball is kicked horizontally from the top of a high cliff with an initial speed of 15m/s. After 2 seconds, which of the following statement describes the ball's horizontal and vertical components?
Correct answer: A. The horizontal velocity is 15m/s while vertical velocity is 20m/s downwards
- A. The horizontal velocity is 15m/s while vertical velocity is 20m/s downwards
- B. The horizontal velocity is 15m/s while vertical velocity is 15m/s downwards
- C. The horizontal velocity is 30m/s while vertical velocity is 20m/s downwards
- D. The horizontal velocity is 15m/s while vertical velocity is 0m/s
Explanation
The horizontal velocity (vx) remains constant because there are no horizontal forces acting on the ball (ignoring air resistance).The vertical component of velocity increases due to gravity. The vertical velocity can be calculated using the formula: vy=g⋅t. which will become 9.8 x 2=19.6 approx. 20m/s.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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