When two bodies move towards each other with constant speed, the distance between them decreases at the rate 6m/sec. If they move in the same direction, the distance between them increases at the rate of 4 m/sec. Calculate their velocities.
Correct answer: A. 5 m/sec, 1 m/sec
- A. 5 m/sec, 1 m/sec
- B. 3 m/sec, 3 m/sec
- C. 6 m/sec, 1 m/sec
- D. 4 m/sec, 2 m/sec
Explanation
Let's name the two unknown speeds as V1 and V2.From the information given,V1+V2 = 6V1 - V2 = 4Solving the equations simultaneously,V1 = 4 + V2Substituiting this in first equation,4 + V2 + V2 = 6 2V2 = 2V2 = 1 m/sV1 = 4 + V2 V1 = 4 + 1V1 = 5 m/s.Option A is the correct answer.
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
An object moves 20 m towards the east and then 10m towards the west in 5 seconds. What is it's average velocity and average speed?
A car travels 30 m toward the east, then it takes a turn and travels 40 m towards the west. It takes 50 seconds. Its average velocity?
If a car is travelling eastward and slowing down, what is the direction of acceleration?
A body will be in translational equilibrium if the vector sum of all the forces acting on it is:
The displacement versus time graph for a body moving in a straight line is shown in the figure. Which of the following regions represents the motion when no force is acting on the body?
Displacement- time graph of a ball thrown vertically upward is shown in figure below and find the v-t of that displacement-time graph given below