A distance-time graph indicates that an object travels 2m in 2s and then travels another 80m during the next 40s. what is the av
2 answers:
Answer:The average speed of the object is 1.95 m/s.
Explanation:
Distance traveled by an object in first interval, = 2 m
Time taken in firsts interval = 2 s
Distance traveled by an object in second interval interval, = 80 m m
Time taken in seconds interval = 40 s
The average speed of the object is 1.95 m/s.
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Answer:
14 m/s
Explanation:
We can solve the problem by using the law of conservation of energy.
At the beginning, when the ball is thrown from the ground, it has only kinetic energy, which is given by
where m = 5.9 kg is the mass of the ball and v is its initial speed.
As the ball goes up, its speed decreases, so its kinetic energy decreases and converts into gravitational potential energy. When the ball reaches its maximum height, the speed has become zero, and all the kinetic energy has been converted into gravitational potential energy, given by:
where g = 9.8 m/s^2 is the gravitational acceleration and h = 10 m is the maximum height reached by the ball.
Since we can ignore air resistance, energy must be conserved, so the initial kinetic energy must be equal to the final potential energy of the ball, so we can write:
And we can solve the equation to find v, the initial speed of the ball: