Reviewer-Projectile-Impulse-Momentum-Mechanical-Energy

A speak takraw that is kicked from a height of two meters follows a path that is _________.

• circular

• linear

• hyperbolic

• parabolic

Answer explanation

A speak takraw kicked from a height follows a parabolic path due to the influence of gravity and the initial velocity. This trajectory is characteristic of projectiles, making 'parabolic' the correct choice.

It is a combination of uniform horizontal motion and free fall.

• Range

• Height

• Trajectory

• Projectile Motion

Answer explanation

Projectile motion is the correct answer as it describes the motion of an object that combines uniform horizontal motion with free fall, resulting in a curved path called a trajectory.

It is the horizontal distance traveled by a projectile.

• Range

• Height

• Trajectory

• Projectile Motion

Answer explanation

The horizontal distance traveled by a projectile is known as its range. This term specifically refers to how far the projectile goes along the ground, distinguishing it from height and trajectory.

The initial velocity of Manuel playing “luksong tinik” has horizontal and vertical components that are equal in magnitude. What angle does his velocity make with the horizontal?

• 30°

• 45°

• 60°

• 90°

Answer explanation

When the horizontal and vertical components of velocity are equal, the angle with the horizontal is 45°. This is derived from the tangent function, where tan(θ) = opposite/adjacent, leading to θ = 45°.

A wedding ring was thrown by a woman horizontally at 15 m/s from the top of a tree house. The ring reached the ground within 3s. What is the range?

• 45 m

• 60 m

• 15 m

• 40 m

Answer explanation

The range can be calculated using the formula: range = velocity × time. Here, range = 15 m/s × 3 s = 45 m. Thus, the correct answer is 45 m.

What is its velocity at the highest point?

• 0 m/s

• -9.8 m/s²

• 10 m/s

• 0 m/s²

Answer explanation

At the highest point of a projectile's motion, the vertical velocity is 0 m/s because it momentarily stops before descending. Thus, the correct answer is 0 m/s.

What is its acceleration at the highest point?

• 0 m/s

• -9.8 m/s²

• 10 m/s

• 0 m/s²

Answer explanation

At the highest point of a projectile's motion, the velocity is zero, but the acceleration due to gravity remains constant at -9.8 m/s². Therefore, the correct answer is -9.8 m/s².

What is its acceleration at the highest point?

• 0m/s

• -9.8 m/s²

• 10 m/s

• 0m/s²

Answer explanation

At the highest point of a projectile's motion, the velocity is zero, but the acceleration due to gravity remains constant at -9.8 m/s². Therefore, the correct answer is -9.8 m/s².

What is its acceleration just before it hits the ground?

• 0 m/s

• -9.8m/s²

• 10 m/s

• 0 m/s²

Answer explanation

The acceleration of an object in free fall near the Earth's surface is approximately -9.8 m/s² due to gravity. This value indicates the object is accelerating downward just before it hits the ground.

Volleyball is played at a speed of 8.0 m/s at an angle 35° above the horizontal. What is the speed of the ball when received by the opponent at the same height?

• 4.0 m/s

• 8.0 m/s

• 9.8 m/s

• 16.0 m/s

Answer explanation

The speed of the ball remains 8.0 m/s when received at the same height due to the conservation of energy and the absence of air resistance. Thus, the correct answer is 8.0 m/s.