A ) 10 m/s
B ) 20 m/s
C ) 30 m/ s
D ) Zero ✅
Explanation:
📚 Explanation for Competitive Exams:
- ✅When a ball is thrown vertically upward, it slows down due to the force of gravity.
- ✅At the highest point, the ball momentarily stops before starting to fall back down.
- ✅Therefore, at that exact highest point, its velocity becomes zero.
- 🔁 After reaching the top, the ball begins to accelerate downward due to gravity.
🔹 Symbol of Force of Gravity:
- F or Fg (where F stands for Force, and g indicates gravity)
- ✅ Formula:
- F=m×g
Where:- 🔹F = Force of gravity (in Newtons, N)
- 🔹m = Mass of the object (in kg)
- 🔹g = Acceleration due to gravity
- 🔹Symbol: F or Fg
- 🔹Value of g: 9.8 m/s²
- 🔹Unit of Force: Newton (N).