How far can your little brother get if he can travel at 2.5 m/s and in 5?
1 answer:
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Answer:
V= 33.98 m/s
Explanation:
Given that
Horizontal speed ,u= 17 m/s
Time taken by rockets to strike the water ,t= 3 s
We know that acceleration due to gravity ,g= 9.81 m/s²
There is no any acceleration in the horizontal direction that is why the horizontal veloity will remain constant.
In the vertical direction
vy = uy+ g t
Initial velocity in vertical direction is 0 m/s.
vy= 0+ 9.81 x 3
vy = 29.43 m/s
The resultant velocity
V= 33.98 m/s
Answer:
t=18s
Explanation:
The final position of an object moving at constant speed is given by the formula , where
is its initial position, v its speed and t the time elapsed.
For the cheetah we have , and for the gazelle
. We want to know at which t their positions are equal, that is,
, which means,
Where we can do:
We then substitute the values we have (the initial position of the cheetah is 0m), writing the meters in km so distance units cancel out correctly:
On the last step we just multiply by 3600 because is the number of seconds in an hour.