Physics · Force and inertia, Newton's first law of motion, momentum, Newton's second Law of motion, impulse, Newton's third Law of motion
A constant force acting on a body of mass changes its speed from to in . The dir
A constant force acting on a body of mass \( 3.0 \mathrm{kg} \) changes its speed from \( 2.0 \mathrm{ms}^{-1} \) to \( 3.5 \mathrm{ms}^{-1} \) in \( 25 \mathrm{s} \). The direction of the motion of the body remains unchanged. What is the magnitude of the force (in newton)?
- A. 0.18
- B. 0.36
- C. 0.72
- D. 0.24
Step-by-step solution
Using Newton's second law: F = ma. Acceleration a = (v - u)/t = (3.5 - 2.0)/25 = 1.5/25 = 0.06 m/s². Then F = 3.0 kg × 0.06 m/s² = 0.18 N.
Related MCQs
- A fly strikes the windshield of a moving truck as shown. What can you say about the forces: the force on the fly and the force on the truck.…
- is the Sl unit of…
- A ball of mass m strikes a rigid wall with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is:…
- The inertia of a moving body makes it:…
- A man is pulling a rope attached to a block on a smooth horizontal table. The tension in the rope will be the same at all points.…