Question 13
Work, Energy and PowerA constant force of magnitude F acts on an object of mass 0.04 kg initially at rest at a point O. If the speed of the object when it has moved 50 m from O is 500 m s−1, what is the value of F?
- A.0.4 N
- B.100.0 N
- C.250.0 N
- D.1000.0 N
Show the answer and explanation
Answer: B (100.0 N)
Explanation
a = v²/2s = 500²/100 = 2500 m s−2. F = ma = 0.04 × 2500 = 100 N.