Question

solve this question completely​

Answer 1

Question :

A ball is thrown vertically upward with acceleration -10 m/s². Stone was thrown with a speed of 25km/hr. Calculate maximum height it attains.

Answer :

Initial velocity = 25 km/hr

• 1 km/hr = 5/18 m/s

∴ 25 km/hr = 25 × 5/18 = 6.94 m/s

Acceleration = -10 m/s²

[Negative sign shows downward direction]

$\star$ Acceleration is said to be constant throughout the motion, we can easily apply equation of kinematics to solve this question.

Third equation of kinematics,

• v² - u² = 2as

Velocity of ball at highest point = zero.

➝ 0² - (6.94)² = 2(-10)H

➝ 48.16 = 20H

➝ H = 2.4 m