Projectile Motion

Easyphysics

A projectile is fired at 20 m/s at 30° above horizontal. Time of flight (g=10 m/s²) is:

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2.0 s

1.0 s

1.5 s

1.2 s

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About This Question

Subject: physics
Chapter: kinematics
Topic: projectile motion
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

2.0 s

For a projectile fired with initial velocity $u$ at an angle $θ$ , the time of flight $T$ is given by: $T = \frac{2 u s i n θ}{g}$ Given:

$u = 20 m/s$
$θ = 3 0^{\circ} ⟹ sin 3 0^{\circ} = 0.5$
$g = 10 m/s^{2}$ Substituting the values: $T = \frac{2 \times 20 \times 0.5}{10} = \frac{20}{10} = 2.0 s$ .

This easy difficulty physics question is from the chapter kinematics, covering the topic of projectile motion. It appeared in the 2025 exam.

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Projectile Motion

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