Question

An object is thrown vertically upwards with
a velocity of 24.5ms, then:
(i) How much height will it attain ?
(ii) How much time will it take to attain the
maximum height?​

Answer 1

Explanation:

When the ball reaches the highest point, its velocity will be zero. So final velocity is v=0m/s

Here, the time to reach highest point is equal to time to hit ground from highest point.

Consider upward motion, the acceleration of the ball is a=−g=−9.8m/s

2

(minus for motion opposite to gravity)

If t be the required time.

Using v=u+at,

0=25+(−9.8)t

⟹ t=2.5s

Thus the ball hits the ground after 2.5 seconds after reaching its highest point.

Answer 2

Answer:

Initial velocity = 24.5 m/s

Acceleration = -9.8 m/s²

As reaching at highest point final velocity = 0

So

v² - u² = 2as

s = 9.8 meters.

So

v = u + at

24.5 = 9.8t

t = 2.5 sec.