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AnActualTrashcan
23.11.2019 •
Mathematics
In a volleyball game, a player on one team spikes the ball over the net when the ball is 10 feet above the court. the spike drives the ball downward with an initial vertical velocity of 55 feet per second. how much time does the opposing team have to return the ball before it touches the court? round your answer to the nearest hundredth.
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Ответ:
4.75 seconds
Step-by-step explanation:
Initial height of the ball from the ground = 10 feet
Upward initial velocity given = 55 feet per second
Value of g ( acceleration due to gravity) = 32.2 feet per s²
Motion of the ball:
The ball first goes vertically upwards, gravity decelerates the body and it momentarily comes to rest at a point in its upward trajectory, which is the point of maximum height. From this point, to the ground, the ball behaves as a freely dropped body.
Till the ball reaches its maximum height:
u = + 55
v = 0 ( final velocity is zero)
a = - 32.2 (since it is deceleration)
we know that v = u + at
⇒ 0 = 55 - 32.2t
⇒ t = 1.7 s
Also , we have s = ut + (1/2)at²
Here, s is the maximum height from the point where ball is thrown
So, s = 55(1.7) - (0.5)(32.2)(1.7)(1.7)
⇒ s = 140 feet
So at a height of 140 feet + 10 feet (initial height) = 150 feet, the ball acts as a freely dropped body.
Here, u = 0
a = +32.2
s= 150
s = ut + (1/2)at²
⇒ 150 = 0.5 ( 32.2) (t²)
⇒ t² = 300/32.2 = 9.31
⇒ t = 3.05 sec
So total time = 1.7 + 3.05 = 4.75 seconds
Ответ:
Step-by-step explanation:
Let Q(t) be the first substance at time t. We know that the rate of change is directly proportional to
.
Hence we can write it as:
Step 1: Integrating the function to form an equation:
Step 2: Substitute the value Q(0) = 45 in equation 1 to find value of C.
Step 3: Substitute the value Q(1) = 10 in equation 2 to find the value of k.
Step 4: Form the equation and simplify it.
Step 5: To find the amount of substance after 2 hours, we substitute the value of t with 2.
The amount of substance after 2 hours is 5.63 grams.