The speed of the star is 255 km/s
Explanation:
The kinetic energy of a body is the energy possessed by the body due to its motion. Mathematically:
where
m is the mass of the object
v is its speed
For the star in this problem, we have:
is the mass
is the kinetic energy
Therefore, the speed of the star is:
Which corresponds to 255 km/s
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solutions:
-50kg
-32kg
-2kg
its 50 kg because as a result of being more heavy the force that is applied to him don't makes hi go as fast as the other one
The answer is B
B: The boat will be pushed away from the dock
Explanation:
Half-life is the time taken for a radioactive material to decay to half its original composition:
Original mass = 48g
Half- life = 2hr
After four half lives;
Initially: 48g
First halving 24
Second halving 12
Third halving 6
Fourth halving 3
After second half life, we would have 12g
At fourth halving, we would have 3g