NTSE STUDY TIPS ON FREE FALL EQUATIONS- Part-2

Once we have mastered the art of calculating time of flight (refer to part-1), we just need two more principles to calculate total distance mentally as STEPS students do.

Principle 3: the time required to reach max height is half the time of flight.

Principle 4: The average velocity under uniform acceleration is average of initial and final velocities. Since the final velocity is zero, the average velocity is simply half of initial velocity.

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Now let us calculate the maximum height of a ball projected up with a speed of 30 m/s which is just the distance travelled up by the projectile before it stops.

Time taken to reach max height =3 s

Average speed is 15 m/s

Max height = 45 m

Isn’t that COOL STUFF! We will cover the case of projectiles in 2-D in the third part.

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