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tester [92]
3 years ago
9

An imaginary line perpendicular to a reflecting surface is called ____refrac_____.

Physics
1 answer:
umka2103 [35]3 years ago
4 0
Not totally sure but i would say a normal? its not refraction or incidence if its perpendicular and i dont think its a mirror if its an imaginary line so yeah normal (normals are always perpendicular to their surface too i think so)
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Answer:

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Explanation:

Given:

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a.

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v_2^2=u_2^2+2.a_2.\Delta s

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a_2= acceleration of the chasing car after braking

0^2=35^2+2\times a_2\times 45

a_2=-13.61\ m.s^{-2} must be the minimum magnitude of deceleration to avoid hitting the leading car before stopping

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time taken by the chasing car to stop:

v_2=u_2+a_2.t_2

0=35-13.61\times t_2

t_2=2.5714\ s  is the time taken to stop after braking

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