tmontefalcon2424
27.07.2020 •
Physics
A 900 kg car is traveling at 20 m/s along the road. What force must be applied to the car to stop it in a distance of 30 m2 Assume a
constant change in velocity.
A. 6000 N
B. 12,000 N
C. 7000 N
D. 18,000 N
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Ответ:
A. 6000 N
Explanation:
v²=u²+2as
0²=20²+2x30xa
-400=60a
a=-400/60
a =-6.667m/s²
f =ma
f = 900 x 6.667 = 6003N
F = 6000N
Ответ:
es el número de veces que aparece o sucede una cosa durante un periodo.