A body is thrown vertically upwards with a speed of 20 m/s. What is the maximum

Practice Questions

Q1
A body is thrown vertically upwards with a speed of 20 m/s. What is the maximum height reached by the body? (Take g = 10 m/s²)
  1. 20 m
  2. 40 m
  3. 30 m
  4. 50 m

Questions & Step-by-Step Solutions

A body is thrown vertically upwards with a speed of 20 m/s. What is the maximum height reached by the body? (Take g = 10 m/s²)
Correct Answer: 20 m
  • Step 1: Identify the initial speed (u) of the body. In this case, u = 20 m/s.
  • Step 2: Identify the acceleration due to gravity (g). Here, g = 10 m/s².
  • Step 3: Use the formula for maximum height (h) reached by the body, which is h = (u²)/(2g).
  • Step 4: Substitute the values into the formula: h = (20²)/(2*10).
  • Step 5: Calculate 20², which is 400.
  • Step 6: Calculate 2*10, which is 20.
  • Step 7: Divide 400 by 20 to find h: h = 400/20.
  • Step 8: Calculate the result: h = 20 m.
  • Kinematics – The study of motion, specifically how objects move under the influence of forces, including equations of motion for objects in free fall.
  • Projectile Motion – A type of motion experienced by an object or particle that is thrown near the earth's surface and moves along a curved path under the action of gravity.
  • Energy Conservation – The principle that energy cannot be created or destroyed, only transformed from one form to another, which applies to the conversion of kinetic energy to potential energy in this scenario.
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