1. How far away will a ball land when thrown from a hill 70 m high at a 45 angle from the horizontal at an initial velocity of 9 m/s? 2. How long will it take for the ball in problem 1 to fall to the ground? Remember the pull of gravity is (-9.8 m/s)

3. What is the maximum height reached by the object?

Explanation:

= Height from where the ball is thrown =

= Angle of inclination =

= Initial velocity =

= Acceleration due to gravity =

Range of projectile is given by

The ball will land away.

Time of flight is given by

The time the ball will stay in the air is

Maximum height is given by

Maximum height the object will reach above the ground is .

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.