On which factors does the time of flight of an ideal projectile depend?
Correct answer A. The vertical component of launch velocity and g
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MDCAT ECAT Physics MCQs
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A cyclist moves 120 m east and then 50 m west in a total time of 20 s. What is the average velocity?
Correct answer D. 3.5 m/s east
A car speeds up uniformly from 5 m/s to 25 m/s in 4 s. What is its acceleration?
Correct answer A. 5 m/s²
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A ball is projected at 20 m/s at 30° above the horizontal. Taking g = 10 m/s², what maximum height does it reach?
Correct answer D. 5 m
A stone is projected at 20 m/s at 45° to the horizontal. Taking g = 10 m/s², what is its horizontal range?
Correct answer C. 40 m
A ball is thrown at 30 m/s at 30° above the horizontal. Taking g = 10 m/s², what is its time of flight?
Correct answer C. 3 s
A ball is thrown horizontally at 15 m/s from the top of a 20 m high cliff. Taking g = 10 m/s², how far from the foot of the cliff does it land?
Correct answer D. 30 m
A 0.2 kg ball hits a wall at 10 m/s and rebounds along the same line at 8 m/s. The contact lasts 0.04 s. What is the average force on the ball?
Correct answer B. 90 N
A 4 kg rifle fires a 20 g bullet with a muzzle speed of 400 m/s. What is the recoil speed of the rifle?
Correct answer D. 2 m/s
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A 2 kg trolley moving at 6 m/s collides with a stationary 4 kg trolley and they stick together. What is their common velocity?
Correct answer D. 2 m/s
A 1 kg ball moving at 6 m/s makes a head-on elastic collision with a stationary 2 kg ball. What is the velocity of the 2 kg ball afterwards?
Correct answer C. 4 m/s
A 3 kg shell at rest explodes into a 1 kg piece and a 2 kg piece. The 1 kg piece moves at 12 m/s. What is the velocity of the 2 kg piece?
Correct answer D. 6 m/s in the opposite direction
Two projectiles are launched with the same speed at 30° and 60°. What is the ratio of their maximum heights, H₃₀ : H₆₀?
Correct answer D. 1 : 3
The velocity-time graph of a car is a curve whose slope keeps changing. What kind of acceleration does the car have?
Correct answer C. Variable acceleration
A displacement-time graph is a straight line parallel to the time axis. What is the state of the body?
Correct answer D. It is at rest
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For an ideal projectile (no air resistance), what happens to the horizontal component of velocity during flight?
Correct answer D. It remains constant
What is the velocity of an ideal projectile at the highest point of its path?
Correct answer C. v₀ cos θ, directed horizontally
At what angle of projection is the horizontal range of an ideal projectile maximum for a given launch speed?
Correct answer D. 45°
A projectile launched at 30° has a certain range. At what other angle, with the same speed, will it have the same range?
Correct answer C. 60°
Which expression states Newton’s second law in terms of momentum?
Correct answer C. F = Δp/Δt