A projectile is thrown horizontally from a 490m high cliff with a velocity of 100 ms-1. The time taken by projectile to reach the ground is:
Correct answer: D. 10 s
- A. 2.5 s
- B. 5.0 s
- C. 7.5 s
- D. 10 s
Explanation
Vertical fall time from height h: h = 1/2 g t² ⇒ t² = 2h/g = 2×490/9.8 = 100 ⇒ t = 10 s. Horizontal speed does not affect during fall time.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Force and Motion questions
A ball with original momentum +4.0 kg x m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
SI unit of impulse is:
A horizontal line in a displacement-time graph represents:
Range of a projectile on a horizontal plane is same for the following pair of angles:
A cricketer can throw a ball to a maximum horizontal distance of 100 m. With the same effort, he throws the ball vertically upwards. The maximum height attained by the ball is:
The maximum horizontal range of a projectile is 400 m. The maximum height attained by it will be: