3 years ago

Câu 1. Trường hợp nào dưới đây không phải là vật sáng?

Physics

1 answer:

Marianna [84]3 years ago

5 0

Answer:

Explanation:

A. The pencil is on the table in broad daylight

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3 years ago

A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally

aivan3 [116]

Answer:

option B

Explanation:

given,

height of building = 0.1 km

ball strikes horizontally to ground at = 65 m

speed at which the ball strike = ?

vertical velocity = 0 m/s

time at which the ball strike

$s = \dfrac{1}{2}gt^2$

$t = \sqrt{\dfrac{2s}{g}}$

$t = \sqrt{\dfrac{2\times 100}{9.8}}$

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vertical velocity at the time 4.53 s = g × t = 9.8 × 4.53 = 44.39 m/s

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= 46.65 m/s

hence, the speed of the ball just before it strike the ground = 47 m/s

The correct answer is option B

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3 years ago