A bomb is dropped from an aeroplane moving horizontally with a speed of 200 mph (miles per hour). If the air resistance is negligible, the bomb will reach the ground in 5 sec when the altitude is (g = 10ms-2):
Correct answer: C. 125 m
- A. 4 miles
- B. 40 m
- C. 125 m
- D. 10 m
Explanation
The bomb is released from an aeroplane moving horizontally, but its vertical motion is influenced solely by gravity. The horizontal speed of 200 mph does not affect the time taken to hit the ground. The formula for vertical distance under gravity is d = 1/2 * g * t^2. Here, g = 10 m/s² and t = 5 s, so the distance d = 1/2 * 10 * 5² = 125 m.Option A is incorrect because it uses the wrong unit (miles instead of meters). Option B also underestimates the distance, while Option D severely underestimates it. Only Option C correctly identifies the vertical distance as 125 m.
Last updated
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.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
(1, 1, 1) . (2, 2, 2)
1st law of motion gives the definition of:
2nd law of motion measures which quantity?
7.0 kg bowling ball experience a net force of 5.0N. What will be its acceleration?
A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30m/s and rebounds up at 20m/s. The impulse on the ball during the collision is: