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GenaCL600 [577]
3 years ago
12

A car accelerates horizontally from rest on a level road at a constant acceleration of Down the road, it passes through two phot

ocells ("electric eyes" designated by 1 for the first one and 2 for the second one) that are separated by 20.0 m. The time interval to travel this 20.0-m distance as measured by the electric eyes is 1.40 as.
(a) Calculate the speed of the car as it passes each electric eye.
(b) How far is it from the start to the first electric eye
Physics
2 answers:
Neko [114]3 years ago
7 0

Answer:A is 14.2857

B is 20M

Explanation:(A)

the velocity or speed of a car is distance/time=20/1.4=14.2857

(B)

Distance between the two eye is 20m

11Alexandr11 [23.1K]3 years ago
5 0

Answer:i totally forgot how that works

Explanation:

??

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What is the mass of a bird if it has a potential energy of 147J when flying at a height of 30 m above the ground?
Artist 52 [7]

Answer:

0.5kg

Explanation:

Given parameters:

Potential energy = 147J

Height  = 30m

Unknown:

Mass of the bird  = ?

Solution:

Potential energy is the energy due to the position of a body. Now, the expression for finding the potential energy is given as;

      P.E  = mgH

m is the mass

g is the acceleration due to gravity = 9.8m/s²

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