Explanation:
At the top of the tree, the velocity of the pebble is purely horizontal so we can calculate it as
What force is required to give an object with mass 2000 kg an acceleration of 3.5 m/s2
2 answers:
<u>Answer:</u> The force exerted on the object is 7000 N
<u>Explanation:</u>
Force is defined as the push or pull on an object with some mass that causes change in its velocity.
It is also defined as the mass multiplied by the acceleration of the object.
Mathematically,
where,
F = force exerted on the object
m = mass of the object = 2000 kg
a = acceleration of the object =
Putting values in above equation, we get:
Hence, the force exerted on the object is 7000 N
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Answer:
Kinetic energy of diver at 90% of the distance to the water is 9000 J
Explanation:
Let d is the distance between the position of the diver and surface of the pool.
Initially, the diver is at rest and only have potential energy which is equal to 10000 J.
As the diver dives towards the pool, its potential energy is converting into kinetic energy due to law of conservation of energy, as total energy of the system remains same.
Energy before diving = Energy during diving
(Potential Energy + Kinetic Energy) = (Kinetic Energy + Potential Energy)
When the diver reaches 90% of the distance to the water, its kinetic energy
is 90% to its initial potential energy, as its initial kinetic is zero,i.e.,
K.E. =
K.E. = 9000 J