An object falls freely near the Earth's surface with no friction. What is its acceleration, to one decimal place?
Answer and explanation
Correct answer: D. About , directed downward
- Step 1: Only the weight acts, so . Step 2. Near the surface pointing down. **Answer: downward. Why not the others:** the unit of speed is wrong, nothing balances the weight, and is ten times too large.
Practise more Mouvement, énergie et ondes.
Free questions with an explanation for every one, and full timed French Baccalaureat mock tests.
More Mouvement, énergie et ondes questions
- According to Newton's second law, what is the relationship between the net force on an object of mass and its acceleration…
- A net force of acts on a body of mass . What is its acceleration?
- What is the kinetic energy of a car of mass moving at ?
- A object descends by . Taking , what is the work done by its weight?
- A wave has a frequency of . What is its period?
- Sound travels at . What is the wavelength of a sound of frequency ?