Question

A tennis ball is hit vertically upward
with a velocity, of 30ms":It takes 3s to
reach the highest point. Calculate the
maximum height reached by the ball .
How long it will take to return
to ground.​

Answer 1

Given:-

• Initial Velocity = 30m/s

• Final Velocity = 0m/s ( As it reaches maximum height)

• Time taken = 3s

• Acceleration due to gravity = -10m/s²

To Find:-

• Maximum Height reached by the ball

• Time taken by ball to return to the ground.

Formulae used:-

• v² - u² = 2gh

Where,

• v = Final Velocity
• u = Initial Velocity
• g = Acceleration due to gravity
• s = Height

Now,

→ v² - u² = 2as

→ (0)² - (30)² = 2 × -10 × s

→ -900 = -20s

→ 900 = 20s

→ s = 900/20

→ s = 45m

Hence, The maximum Height reached by ball is 45m

We also know that,

→ Time of ascent = Time of descent

So,

→ Time of ascent = 3s

→ Time of descent = 3s

Therefore

→ Time taken to return to ground = 3 + 3 = 6s

Hence, The time taken to return to ground is 6s.

Answer 2

Answer:

Explanation:

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