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kirstenb278
12.09.2019 •
Mathematics
Oco serves a tennis ball at vs = 50 m/s and charges the net at vc = 10 m/s. the opponent, x = 25 m away on the other side of the court, returns the ball with a speed half that of the serve. how close does coco get to the net (x/2 away) before she meets the return?
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Ответ:
3.055 m
Step-by-step explanation:
In this solution we will use next notation:
d= Total distance traveled by Oco since serving the ball until meeting the return.
We know that oco serves at vs = 50 m/s and her opponent is x=25 m away. Then, t_1 is given by
To compute t_2 observe that the return speed is 12.5 m/s and the distance that the ball will travel is
. Then,
Therefore,
Finally, as Oco started 12.5m away from the net, when she meets the return she will be
away from the net.
Ответ:
11+k=29
Step-by-step explanation:
So "more than" means addition.
let's solve this for fun
11 + k =29
k = 29-11
k= 18