Projectile Motion

A ball is projected upward at a certain angle with the horizontal .which of the following statement is/are correct. At highest point

• a. velocity of the projectile is not zero

• b. acceleration of the projectile is zero

• c. velocity of the projectile is along the horizontal direction

• d. Acceleration of the projectile is vertically upwards

Which of the following remains constant during the motion of the projectile fired from a planet,

• a. KE

• b. Momentum

• c. Vertical component of the velocity

• d. Horizontal component of the velocity

A boy throws a ball at an angle of 30º at a speed of 20 m/s. After how much time the vertical velocity will be zero and what is the total time of flight?

• 2.04, 1.02

• 1.02, 2.04

• 1.02, 1.02

• 2.04, 2.04

A boy throws a ball at an angle of 30º at a speed of 20 m/s. What is vertical component of velocity and what is the horizontal component of velocity?

• 15 m/s , 12.5 m/s

• 20 m/s, 15 m/s

• 10 m/s , 17.32 m/s

• 12.5 m/s, 12.5 m/s

At the start of a horizontal projectile motion, what is assumed?

• Gravity is 0

• Initial velocity is 0

• Initial vertical velocity is 0

• Initial horizontal velocity is 0

In the absence of air resistance, the angle at which a thrown ball will go the farthest is?

• 90°

• 30°

• 60°

• 45°

When the projectile is at the highest point of its trajectory, the direction of its velocity and acceleration are

• a. parallel to each other

• b. anti parallel to each other

• c. Inclined to each other at 45

• d. Perpendicular to each other

The horizontal and vertical displacement of the projectile at time t are x = 36t, y = 48t – 4.9 t ^2.

where x and y are in meters and t in second. Initial velocity of the projectile in m/s

• 15

• 30

• 45

• 60

the angle of projection at which the horizontal range and maximum height of a projectile are

• or, θ = tan -1 ( 4)

• or, θ = tan -1 ( 2)

• or, θ = tan -1 (1/ 2)

• or, θ = tan -1 ( 3)

When the projectile is at the highest point of its trajectory, the direction of its velocity and acceleration are

• a. parallel to each other

• b. anti parallel to each other

• c. Inclined to each other at 45

• d. Perpendicular to each other