Answer:
im smart pls mark brainliest
Explanation:
12 seconds
For free falling bodies, the final velocity may be calculated through the equation,
Vf = gt
Where g is the acceleration due to gravity (9.8 m/s²) and t is the time elapsed. Substituting the known values,
Vf = (9.8 m/s²) x (4 s) = 39.2 m/s
Therefore, the object's velocity is approximately 39.2 m/s.
Answer:
The resistance will be twice the original resistance
Explanation:
This is a fairly simple question, the formular for the resistance of a wire is given as
R = rho *length / area
Where R = resistance
Rho = resistivity
L = length
A = area
Since the density and area are constant I.e they do not change
R/ length = rho/ area
The initial length is given as L, when this length is stretched to twice its original length ,it becomes 2×L = 2L
Let x represent the resistance when the length is doubled
R/ L = x / 2L
x = 2LR / L ; dividing by L
We have that x = 2R ; twice the resistance
