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A stone is thrown vertically upwards with a speed of 15 m/s. How long will it ta

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Question: A stone is thrown vertically upwards with a speed of 15 m/s. How long will it take to reach the highest point? (Take g = 10 m/s²) (2023)

Options:

  1. 1.5 s
  2. 2 s
  3. 3 s
  4. 4 s

Correct Answer: 2 s

Exam Year: 2023

Solution: 

Time to reach highest point = u/g = 15/10 = 1.5 s.

A stone is thrown vertically upwards with a speed of 15 m/s. How long will it ta

Practice Questions

Q1
A stone is thrown vertically upwards with a speed of 15 m/s. How long will it take to reach the highest point? (Take g = 10 m/s²) (2023)
  1. 1.5 s
  2. 2 s
  3. 3 s
  4. 4 s

Questions & Step-by-Step Solutions

A stone is thrown vertically upwards with a speed of 15 m/s. How long will it take to reach the highest point? (Take g = 10 m/s²) (2023)
  • Step 1: Understand that when a stone is thrown upwards, it will eventually stop rising and reach a highest point before falling back down.
  • Step 2: Know that the initial speed (u) of the stone is 15 m/s.
  • Step 3: Recognize that the acceleration due to gravity (g) is acting downwards at 10 m/s².
  • Step 4: To find the time (t) it takes to reach the highest point, use the formula: t = u / g.
  • Step 5: Substitute the values into the formula: t = 15 m/s / 10 m/s².
  • Step 6: Calculate the time: t = 1.5 seconds.
  • Kinematics – The question tests the understanding of the motion of an object under uniform acceleration, specifically the equations of motion related to vertical projectile motion.
  • Acceleration due to Gravity – It assesses the knowledge of how gravitational acceleration affects the motion of objects thrown vertically.
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