Question

A ball is thrown vertically upwards and reaches a
maximum height in 3s. Find:
(a) the velocity with which it was thrown upwards,

please answer with step by step explanation.
best ans will get brainliest

Answer 1

Answer:

29.4 m/s

Explanation:

At maximum height, velocity becomes zero.

Initial velocity u = ?

Final velocity v = 0

a = -g = -9.81 m/s^2

v = u + at

u = v - at

u = 0 - (-9.81)(3)

u = 29.4 m/s

Answer 2

• Explanation:

Answer

Given : Time taken to reach the maximum height t=3 s a=−g=−10m/s

2

The initial velocity of the ball can be calculated by,

Using v=u+at

∴ 0=u−10×3 ⟹u=30 m/s

Using S=ut+

2

1

at

2

∴ S=30×3+

2

1

×(−10)×3

2

=45m