Question

•A firecracker is fired and it rises to a height of 1000m. Find the (1) Velocity by which it was released
(2) Time taken by it to reach the highest point. (take g= 9.8m/s²)​

Answer 1

Answer:

Given:

V=0

g=9.8m/s²

h=1000m

U=?

So, V²-U²=2gh

= (-U)²=2×-9.8×1000

= (-U)²= -19600

= U=14m/s

2) Now, v=u+gt

u+gt=o

14-9.8t=o

-9.8t=-(14)

t=14/9.8

t=1.4s

Therefore the velocity with which it was released=14m/s

and the time taken to reach at the highest point=1.4s

Explanation:

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