A toy rocket, weighing mg=10 N, blasts straight up from a stadium of height (h) above the ground with a kinetic energy of 40 J.
1 answer:
Answer:
Height of the stadium is 24 m
Explanation:
We have given weight of the rocket mg = 10 N
Total mechanical energy is given = 280 J
Kinetic energy is given Ke = 40 J
We have to find the height of stadium
Mechanical energy is the sum of potential energy and kinetic energy
So potential energy is equal to = 280-40 =240 J
So
h = 24 m
So height of the stadium is 24 m
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Answer:
The baseball was falling during 1.733 seconds.
Explanation:
The baseball experimented a free fall, which is a particular case of uniformly accelerated motion, in which object is accelerated by gravity. In this case, we need to determine the time spent by the ball before hitting the ground (), measured in seconds, which is determined by the following kinematic formula:
(1)
Where:
,
- Initial and final speeds of the baseball, measured in meters per second.
- Gravitational acceleration, measured in meters per square second.
If we know that ,
and
, then the time spent by the baseball is:
The baseball was falling during 1.733 seconds.