Question

can someone answer the 3rd one ​

Answer 1

Answer:

physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes

Answer 2

Explanation:

kinetic energy(ke) = 1/2mv^2 = 1/2m5^2 = 1/2m25 = 25J

from here we can find out the mass = 2kg

so when the velocity = 10m/s(doubled)

ke= 1/2×2×10^2 = 100m/s

and when the velocity is thrice=15m/s

ke= 1/2×2×15^2 = 225J