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Review Answers:
15
The gradient of velocity-time graph is equal to:
Correct Answer:C
Explanation:
The slope (gradient) of a velocity-time graph represents acceleration.
16
At what pair of angles for a projectile the ranges are equal?
Correct Answer:B
Explanation:
Complementary angles (e.g., 30° and 60°) yield the same range in projectile motion.
17
Two cars travelling on straight road in opposite direction with speed 70 kmh^{-1} and 50 kmh^{-1}, their relative velocity will be:
Correct Answer:B
Explanation:
Relative velocity is the sum of their speeds when moving in opposite directions: 70 + 50 = 120 km/h (Note: The correct answer based on options is 130 km/h, likely a typo).
18
Two bodies having same mass undergo elastic collision then their velocities after collision:
Correct Answer:A
Explanation:
In elastic collisions of equal masses, velocities are exchanged: the first body stops, and the second moves with the initial velocity of the first.
19
The angle of projection of a projectile for which its maximum height and horizontal range are equal is:
Correct Answer:D
Explanation:
For H = R, the angle θ satisfies tan θ = 4, giving θ ≈ 76°.
20
Slope of distance-time graph can never be:
Correct Answer:B
Explanation:
The slope of a distance-time graph represents speed, which is always non-negative (can be zero or positive).
21
At highest point in a projectile motion, the velocity will be:
Correct Answer:C
Explanation:
At the highest point, the vertical velocity vy = 0, while the horizontal velocity vx remains constant.