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Inga [223]
3 years ago
7

Which example provides a complete scientific description of an object in motion?

Physics
2 answers:
alexandr402 [8]3 years ago
6 0

Answer:

The marble moved 30 cm north in 6 seconds. is correct

Explanation:

according to K12

100% sure

shutvik [7]3 years ago
5 0
The nall rolled 20 cm in 5 seconds
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A young hockey player stands at rest on the ice holding a 1.3-kg helmet. The player tosses the helmet directly in front of him w
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Answer

given,

initial speed of hockey player= 0 m/s

mass of the helmet, m = 1.3 Kg

initial speed of the helmet, u = 0 m/s

final speed of the helmet, v = 6 m/s

recoil speed of the hockey player, v' = 0.25 m/s

we need to calculate the mass of the hockey player, M = ?

using conservation of momentum

m u + M u' = M v' + m v

initial speed of ice skater is zero

1.3 x 0 + M x 0 =  M x (-0.25) + 1.3 x 6

negative sign is taken because recoil velocity is in opposite direction

0 = -0.25 M + 7.8

0.25 M = 7.8

M = 31.2 Kg

Hence, the mass of the young hockey player is equal to 31.2 Kg

5 0
3 years ago
An object dropped from Cliff falls with a constant acceleration of 10 metre per second square find its Speed of two seconds afte
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Answer:

20 meters per second

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