A ball is thrown upwards with a speed of 20 m/s. How high will it go before it s

A ball is thrown upwards with a speed of 20 m/s. How high will it go before it starts to fall back?

A ball is thrown upwards with a speed of 20 m/s. How high will it go before it starts to fall back?

Step 1: Identify the initial speed (u) of the ball, 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 ball will reach before it starts to fall back is approximately 20.4 meters.

Kinematics – The question tests the understanding of the kinematic equations of motion, specifically the calculation of maximum height in projectile motion.
Gravitational Acceleration – It assesses knowledge of gravitational acceleration (g) and its role in determining the motion of objects under gravity.