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# Badly need help for physics homework help plz?

the speed of a 6 kg mass changes frm 6 m/s to 10 m/s.find the change in kinetic energy

A body is released frm a height of 30m find its speed when it hits the ground,speed at a height of 20m,height at which the speed is 15 m/s

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- scott8148Lv 78 years ago
kinetic energy is proportional to the square of the velocity (1/2 m v^2)

calculate the two energies , subtract to find the change

gravitational potential energy is ___ m * g * h

___ this is converted to kinetic energy when the object falls

___ 1/2 * m * v^2 = m * g * h ___ v = √(2 * g * h)

plug in the height(s) to find the speed(s)

plug in the speed to find the height

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