Question

An object is thrown vertically upwards so height 19.6 m. find the initial velocity of the object and time taken to reach the ground​

Answer 1

Answer:

hope this will help you

Explanation:

The ball returns to the ground in 5 seconds. This means that the ball takes 2.5 seconds to attain the maximum height. Let me check if this information is correct. Applying v=u+at , (at maximum height, the speed of the ball, v=0 and a=−g=−9.8 ms−2 ) we can find that the time required to reach maximum height is 2 seconds. Hence, the given information is wrong. But, we can still solve it using another formula.

Now, applying the formula v2=u2+2as , (here, a=−g=−9.8 ms−2 , s=h , maximum height) :

02=(19.6)2+2⋅(−9.8)⋅h⟹h=19.6

∴ Maximum height attained by the ball is 19.6 m.