Ametal bal is held at rest h=65.0 cm above the floor. the ball is released with no initial velocity. how much time does it take to hit the floor?

Metal ball will take 0.364 seconds to reach floor.

Explanation:

Initial height from ground = 65 cm = 0.65 meter

We have equation of motion , , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this the velocity of body in vertical direction = 0 m/s, acceleration =acceleration due to gravity = 9.8 , we need to calculate time when s = 0.65 meter.

Substituting

So it will take 0.364 seconds to reach floor.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

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