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Anonymous users2024-01-24This is the investigation of Newton's laws, the object will have acceleration at the same time as the force (the net force is not zero) does not need time, and the velocity is only manifested by the accumulation of acceleration in time (V=at motion formula with time, time is 0, velocity is 0), you will understand more deeply after learning calculus, but you can simply remember that force and acceleration are directly linked, and there is acceleration when there is force, so B is right.
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Anonymous users2024-01-23It's not moving when it's released, so there's no speed
1. In reality, it is necessary to bounce a few times, because the velocity of the object is not zero when it is compressed to the equilibrium of the force, it will convert its kinetic energy into elastic potential energy, that is, continue to compress until the velocity is zero, but then the force is unbalanced, the elastic potential energy will be converted into a part of the kinetic energy, so that the object will move again until the force is balanced, and the above process will be repeated to know that the kinetic energy of the object is dissipated by the external force, so that the velocity of the object is also zero when the force is balanced, and then the object is completely stationary!
Generally not compressed to a stationary one. Ordinary small objects are not very deformed. Unless it's something very heavy. I don't know what object you're talking about.
After merging into blocks, if the country wants to change directly into the block, there is no need to decompose it, isn't it very convenient, which is troublesome
h=45m
h=1/2gt^2 t=(2h/g)^1/2=(2*45/10)^1/2=3s >>>More
I feel that you are damp, your skin is damaged and allergic, sometimes you sleep in a ventilated or cool place, sweat or tears will remain on the skin, because the eye skin is relatively weak, so it is easy to have inflammation or allergies, it should not be a big problem.