In the absence of air resistance, an object thrown into the air at an angle of 20 degrees to the ground. It will experience:
Correct answer: A. Constant vertical acceleration
- A. Constant vertical acceleration
- B. Changing vertical acceleration
- C. Changing horizontal acceleration
- D. Constant (non zero) horizontal acceleration
Explanation
The only acceleration a free-thrown object experiences is the gravitational acceleration, which at all times is constant (in this case) and is vertically towards the earth's surface. It will experience weightlessness, for a while, then a jolt, when it hits the ground (moves under the influence of gravitational acceleration) The angle is irrelevant: the experience will be the same regardless of the angle. The only difference that angle would make is how long the experience would last. Without the launch speed, the time that the experience lasts also remains unknown.
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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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