A motor car can be stopped within a distance of S, when it moves with a speed v. If it moves with a speed 4v, it can be stopped within a distance (assuming constant breaking force)
Correct answer: D. 16S
- A. S
- B. 4S
- C. 2S
- D. 16S
Explanation
The stopping distance is proportional to the square of the speed of the vehicle. This relationship is given by the formula S = k*v2, where S is the stopping distance, v is the speed, and k is a constant that depends on the braking force and other factors. When the speed is increased from v to 4v, the stopping distance becomes (4v)2 = 16v2. Therefore, the stopping distance is 16S. The other options do not correctly apply this squared relationship and are therefore incorrect.
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 person just supports a mass of 20 kg suspended from a rope.What is the resultant force acting on the mass?
A person travels along a straight road for the first half time with a velocity V1 and the second half time with a velocity V2 .Then the mean velocity v is given by
An athlete completes one round of a circular track of radius R in 40 sec. What will be his displacement at the end of 2 min. 20 sec?
What is the angle of projection for which the range and maximum height become equal?
A bullet is fired with a gun from tower horizontally with a velocity 400 m/s. at the same time, a stone is dropped from the same tower.
The engine of a car produces an acceleration of 6 m s-2 in the car. If this car pulls another car of the same mass, then the acceleration would be