Question

Vertical Throw - Physics

Answer 1

Question :

A baseball is hit straight up into the air with a speed of about 20m/s.

(a) How high does it go?

(b) How long is it in the air?

Given :

Initial velocity of the ball = 20m/s

To Find :

Maximum height attained by the ball and tine taken to reach there.

Solution :

❖ For a body thrown vertically upward, g is taken negative.

Since constant acceleration due to gravity acts on the ball throughout the motion, equation of kinematics can be applied to solve this question$.$

♦ Maximum height :

Applying third equation of kinematics,

➠ v² - u² = 2gH

➠ 0² - 20² = 2(-10) × H

➠ -400 = -20H

➠ H = 400/20

➠ H = 20 m

♦ Time of ascent :

Applying first equation of kinematics,

➠ v = u + gt

➠ 0 = 20 + (-10)t

➠ -20 = -10t

➠ t = 2 s