emarquez05

28.02.2020 • 

Physics

A car is traveling at the posted speed limit of 6.70 m/s (15 miles/h) in a school zone. The car passing a school bus when a child darts out from in front of the bus. The car is 10.0 m from the child when the driver of the car applies the brakes. The car decelerates at a constant rate of 4.00 m/s2 until coming to a halt. Calculate the
(a) distance of the car travels while decelerating and
(b) distance required to stop if the car is initially traveling at 13.4 m/s (30.0 miles/h).

Ответ:

sofialarrea13

19.01.2022

Physics

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5.6m and 22.4m

Explanation: from the 3rd equation of motion

v²=u²+2as

v²-u²=2as  where : v=0 u=6.7m/s a=4m/s² s=?

0-6.7²=2×4×s

44.89=8s

s=44.89÷8

s=5.6m

for the second part, we shall still make use of the same equation.

v²-u²=2as         where: a=4m/s² u=13.4m/s v=0 s=?

0-13.4²=2×4×s

179.56=8s

s=179.56/8

22.4m

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Ответ:

vcortez

07.08.2020

Physics

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Samantha wants to find the perimeter of a square to be able to build a frame for her new photos she took. Altogether, the sides should equal 14 inches. Sides A, B, and C equal 4, 4, and 6 inches. What is side D?

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