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lord [1]
3 years ago
12

The bowling ball is whizzing down the bowling lane at 4 m/s. If the mass of the bowling ball is 7 kg, what is its kinetic energy

?
Physics
2 answers:
luda_lava [24]3 years ago
5 0

Answer:

56J

Explanation:

Formula to calculate kinetic energy:

K=(1/2)*m*v^{2}  ,equation (1)

K: It's the kinetic energy in Joules (J)

m: body mass in kilograms (kg)

v: body speed in meters / second (m / s)

Known information:

m = 7kg

v = 4 m / s

We replace the known information in  the equation 1:

K=( 1/2)*7*4^{2}

K=56 kg*m^{2} /s^{2} = 14 Newton*metro

K=56J

Lisa [10]3 years ago
3 0
Kinetic Energy = 1/2xmassx(velocity)^2
Input values;
K.E=1/2x7kgx(4m/s)^2
K.E.=56J
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Answer:

a) During the reaction time, the car travels 21 m

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The equation for the position of a straight movement with variable speed is as follows:

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When the speed is constant (as before applying the brake), the equation would be:

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a)Before applying the brake, the car travels at constant speed. In 0.80 s the car will travel:

x = 0m + 26 m/s * 0.80 s = <u>21 m  </u>

b) After applying the brake, the car has an acceleration of -7.0 m/s². Using the equation for velocity, we can calculate how much time it takes the car to stop (v = 0):

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