If the initial velocity of a projectile is doubled, keeping the angle of projection the same, the maximum height reached by it will:

1. Remain the same

2. Be doubled

3. Be quadrupled

4. Be halved

In the motion of a projectile under gravity, its:

1. Total energy is conserved

2. Momentum is conserved

3. Energy and momentum are both conserved

4. None is conserved

The range of a projectile for a given initial velocity is maximum when the angle of projection is \(45^°\). The range will be minimum if the angle of projection is:

1. \(90^°\)

2. \(180^°\)

3. \(60^°\)

4. \(75^°\)

A ball is thrown upwards and it returns to the ground describing a parabolic path. Which of the following remains constant?

(1) Kinetic energy of the ball

(2) Speed of the ball

(3) Horizontal component of velocity

(4) Vertical component of velocity

An object is thrown along a direction inclined at an angle of \(45^°\) with the horizontal direction. The horizontal range of the particle is equal to:

1. Vertical height

2. Twice the vertical height

3. Thrice the vertical height

4. Four times the vertical height

The height y and the distance \(x\) along the vertical plane of a projectile on a certain planet (with no surrounding atmosphere) are given by \(𝑦 = ( 8 𝑡 − 5t^ 2 )\) meter and \(x = 6t\) meter, where \(t\) is in seconds. The velocity with which the projectile is projected is:

1. \(8\ \text{m/s}\)

2. \(6\ \text{m/s}\)

3. \(10\ \text{m/s}\)

4. Not obtainable from the data

The range of a particle when launched at an angle of \(15^°\) with the horizontal is \(1.5\ \text{km}\). What is the range of the projectile when launched at an angle of \(45^°\) to the horizontal:

1. \(1.5\ \text{km}\)

2. \(3.0\ \text{km}\)

3. \(6.0\ \text{km}\)

4. \(0.75\ \text{km}\)

A projectile thrown with a speed \(v\) at an angle \(θ\) has a range \(R\) on the surface of the Earth. For same \(v\) and \(θ\), its range on the surface of the Moon will be \(\left(\text{acceleration due to gravity on moon}=\dfrac g6\right)\):

1. \(R/6\)

2. \(6 R\)

3. \(R/36\)

4. \(36 R\)

A ball is projected with kinetic energy \(E\) at an angle of \(45^°\) to the horizontal. At the highest point during its flight, its kinetic energy will be:

1. Zero

2. \(\dfrac E2\)

3. \(\dfrac E{\sqrt2}\)

4. \(E\)