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andrew-mc [135]
3 years ago
10

Theweight ofof body is 420N .Calculate its mass​

Physics
1 answer:
Nady [450]3 years ago
6 0

Answer:

42.87

Explanation:

Google

<u>OR</u>

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420/9.8 which equals 42.87.

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All galaxies follow the law of gravity. True or False
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What are some of the forces affecting rock climbers?​
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Read 2 more answers
A man works on a striaght road from his home to market 2.5km away dwith a speed of 5km/h.Finding the market closed, he instantly
umka21 [38]

Answer:

5.625km/h

Explanation:

We are given that

Distance between home and market, d=2.5 km

Speed, v1=5km/h

Speed, v2=7.5 km/h

We have to find the average speed of the man over the interval of time 0 to 40min.

Time,t=\frac{distance}{speed}

Using the formula

t_1=\frac{2.5}{5}=0.5 h=0.5\times 60=30 min

1 hour =60 min

t_2=\frac{2.5}{7.5}=\frac{1}{3}hour=\frac{60}{3}=20min

Distance traveled by man in 10 min with speed 7.5 km/h=\frac{2.5}{20}\times 10=2.5/2km

Therefore,

Total distance covered=2.5+2.5/2=3.75 km

Time=40 min=40/60=2/3 hour

Average speed=\frac{total\;distance}{total\;time}

Average speed=\frac{3.75}{2/3}=5.625km/h

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3 years ago
What is the use of scientific knowledge and research for an action
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