SanaiHardrick
11.02.2020 •
Physics
A 20kg box is dropped 13m. how much work is done
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Ответ:
w = 2550.6[J]
Explanation:
We have to remember the definition of work, which is defined as the product of force by the distance travelled.
For this case we have that the force is equal to the product of the mass by the acceleration of gravity
F = m*g
where:
m = 20[kg]
g = 9.81[m/s^2]
Therefore
F = 20*9.81
F = 196.2[N]
And work is given by:
W = F*d
Where:
F = force = 196.2[N]
d = distance = 13 [m]
W = 196.2*13
W = 2550.6[J]
Ответ:
Explanation:
Given:
initial speed of the car,Distance travelled during the time span:
Actually the distance travelled before stopping the car will be greater than this distance, because after the application of brakes the car will take some time to come to rest.