Physics, 01.11.2020 18:50 dgray4410

A snow ball is thrown upward at a speed of 27 m/s. How high is the snow ball 3.5 seconds later? Also, how fast is it moving at that time?

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Answer from: adyenamaie02

The snow ball will achieve the height of 34.75 m and at that height, it will move with a speed of 61.3 m/s.

Given data:

The initial speed of the snow ball is, u = 27 m/s.

The time taken by the snow ball to achieve a height is, t = 3.5 s.

Clearly, the ball rising high will need a mathematical formula which utilizes the initial velocity and final velocity (v). So, using the first kinematic equation of motion as,

v = u + gt

Here,

g is the gravitational acceleration.

Solving as,

v = 27 + (9.8 × 3.5)

v = 61.3 m/s

Now, if we calculate the height achieved through the second kinetic equation of motion as,

$h = ut + \dfrac{1}{2}(-g)t^{2}\\\\h = (27 \times 3.5) + \dfrac{1}{2} \times (-9.8) \times 3.5^{2}\\\\h = 34.75 \;\rm m$

Thus, we can conclude that the snow ball will achieve the height of 34.75 m and at that height, it will move with a speed of 61.3 m/s.

Learn more about the kinematic equations of motion here:

link

Answer from: nataliaaaaa10

Dy = 111.66 [m]

t = 3.5 [s]

Explanation:

To solve this problem we must use the equations of kinematics.

$v_{f} = v_{o} - (g*t)\\$

where:

Vf = final velocity [m/s]

Vo = initial velocity = 27 [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time = 3.5 [s]

Note: The negative sign of the equation means that the gravity acceleration goes in opposite direction

Vf = 27 - (9,81*3,5)

Vf = - 7.33 [m/s] (this negative sign indicates that at this moment the snowball is going downwards)

To find how high the snowball was we must use the following equation:

$Dy=v_{o} *t+\frac{1}{2}*g*t$

Dy = (27*3.5) + (0.5*9.81*3.5)

Dy = 94.5 + (17.16)

Dy = 111.66 [m]

Answer from: Quest

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

Answer from: Quest

Yes

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A snow ball is thrown upward at a speed of 27 m/s. How high is the snow ball 3.5 seconds later? Also...