contestada

a ball is thrown in the air at 20 m/s. ignoring redistance, what is the speed when it returns to the level at which it was thrown?

Respuesta :

Ball is projected upwards with speed 20 m/s

now using kinematics

[tex]v_f^2 - v_i^2 = 2 a\delta x[/tex]

here when ball returns back to same position.

total displacement of ball will be zero.

[tex]v_f^2 - v_i^2 = 0[/tex]

[tex]vf = vi[/tex]

So ball will return to initial position with same speed in opposite direction.

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