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SCORPION-xisa [38]
3 years ago
14

Melissa purchased $39.46 in groceries at a store. The cashier gave her $1.46 in change from a $50 bill.

Mathematics
1 answer:
vodka [1.7K]3 years ago
3 0

Answer:

A=10.54 change

Step-by-step explanation:

50-39.46=10.54

The cashier gave incorrect change.

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A sprinter who weighs 706 N runs the first 5.5 m of a race in 1.6 s, starting from rest and accelerating uniformly. What are the
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Answer:

(a) Speed = 6.875 m/s

(b) Kinetic Energy = 1.70 kJ

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Step-by-step explanation:

Given:

d = 5.5 m

t = 1.6 s

W = 706 N

Part (a)

Using the equation of motion with the assumption of zero initial speed:

d = \frac{1}{2} ({v-0})t

5.5= \frac{1}{2} (1.6v)

The speed of the sprinter then become:

v = 6.875 m/s

Part (b)

Convert the weight of the sprinter to mass:

m = \frac{w}{g}

m = \frac{706}{9.8}

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KE (Kinetic Energy) can then be calculated as:

KE = \frac{1}{2} mv^{2}

KE = \frac{1}{2} (72)(6.875)^{2}

KE = 1701.56 J = 1.70 kJ

Part (c)

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3 years ago
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