# Projectile Motion

Aristotle (~400 BC) believed the rate at which an object falls was directly related to its mass. It wasn't until the late 1500s that Galileo questioned his ideas and accurately described projectile motion. His most relevant discovery was to divide motion into the separate components of constant forward velocity and the downward acceleration of free fall.

Objects fall to the ground at the same rate because the acceleration due to gravity is the same for all objects. All objects accelerate toward Earth at a rate of 9.8 meters per second per second (9.8 m/s/s) Horizontal motion of a projectile moves at a constant velocity, covering equal distances in equal time intervals. There is no horizontal acceleration. The vertical component of a projectile's velocity is subject to the force of gravity. It accelerates downward resulting in greater distances that are covered in each successive time interval. The horizontal and vertical components of projectiles are completely independent of each other.

Created by: jegan
1. The horizontal range covered by a projectile is proportional to
2. At the top of the trajectory of a projectile, the direction of its velocity and acceleration are
3. A ball is thrown with initial velocity,u at an angle,@ with the vertical. The velocity of the ball at the highest point will be
4. A bullet is fired with velocity 100 m/s at an angle 30degree with the horizontal. The bullet will return to ground after a time interval of (g= 9.8 m/s^2)
5. Which of the following does not change when a projectile is fired at an angle with the horizontal
6. The range of a particle when projected at an angle 15degree with the horizontal is 1.5 km. What will be its range when it is projected at an angle 45degree to the horizontal?
7. A stone is projected air. Its time of flight is 3s and the range is 150 m. Maximum height reached by the stone is
8. A bullet is fired from gun when the angle of elevation of the gun is 30degree and then another bullet when the angle of elevation is 60degree. It is then concluded that
9. A base is thrown with an initial velocity of 100 m/s at an angle 30degree above the horizontal. How far from the throwing point will it attain its original level?
10. A body is projected horizontally from the top of a tower with a speed of 20 m/s. After 2 sec, its speed will be

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