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Monica [59]
2 years ago
12

A ball bounces changing velocity from vi=15m/s[D] to vf=15m/s[U] in t=0.01s. The balls acceleration is *

Physics
2 answers:
fomenos2 years ago
5 0

Answer:

Option (A) is correct

Explanation:

a= (vf-vi)/ t

put the values

hence,

a= ( 15-15)/0.01

a=0

kozerog [31]2 years ago
5 0

Answer:

C) 3000 m/s/s

Explanation:

acceleration is the time rate of change of velocity

velocity is a vector

a = (vf - vi) / t

If UP is the positive direction

a = (15 - (-15)) / 0.01

a = 30 / 0.01

a = 3000 m/s²

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Answer:

Rutherford bombarded aluminum foil with beam of light known as alpha particles. The mass of this alpha particle is equivalent to helium atom.

Explanation:

Rutherford bombarded aluminum foil with beam of light known as alpha particles. The mass of this alpha particle is equivalent to helium atom.

When this alpha particles were made to strike the aluminum foil, some passed through the foil, some were reflected and speed others changed.

The ones reflected encountered heavier particle known as the nucleus, preventing them from passing through it. The whole observations indicated that atom is not is uniformly charged sphere as proposed by J.J Thomson.

Rutherford proposed new model known as the Planetary model of atom, which described atom as containing a nucleus which is revolved by electron, just like planets revolve round the sun. And this nucleus contains opposite charge to electron which is proton, to balance the motion.

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Explanation:

Mass of bumper cars, m_1=m_2=110\ kg

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So, the velocity of car Z after the collision is (-12 m/s). Hence, this is the required solution.

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