A stone is thrown vertically upward with a speed of 20 m/s. How high will it ris

Practice Questions

Q1
A stone is thrown vertically upward with a speed of 20 m/s. How high will it rise before coming to rest?
  1. 10 m
  2. 20 m
  3. 30 m
  4. 40 m

Questions & Step-by-Step Solutions

A stone is thrown vertically upward with a speed of 20 m/s. How high will it rise before coming to rest?
  • Step 1: Identify the initial speed (u) of the stone, which is given as 20 m/s.
  • Step 2: Identify the acceleration due to gravity (g), which is approximately 9.8 m/s².
  • Step 3: Use the formula for maximum height (H) when an object is thrown upwards: H = (u²) / (2g).
  • Step 4: Substitute the values into the formula: H = (20 m/s)² / (2 * 9.8 m/s²).
  • Step 5: Calculate (20 m/s)², which equals 400 m²/s².
  • Step 6: Calculate 2 * 9.8 m/s², which equals 19.6 m/s².
  • Step 7: Divide 400 m²/s² by 19.6 m/s² to find H: H ≈ 20.4 m.
  • Step 8: Conclude that the maximum height the stone will rise before coming to rest is approximately 20.4 meters.
  • Kinematics – The study of motion, specifically how objects move under the influence of forces, including the equations of motion for objects in free fall.
  • Projectile Motion – The motion of an object thrown into the air, which is influenced by gravity, and involves calculating maximum height, time of flight, and range.
  • Energy Conservation – The principle that energy cannot be created or destroyed, only transformed, which applies to the conversion of kinetic energy to potential energy at the maximum height.
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