Use a proportion to find the percent.
what percent of 90 is 50?
55.6%
65.2%
180%
43%

C. 180%

Step-by-step explanation:

x = 90 × 100 ÷ 50

x = 180%

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a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²