Answer:
3.97 m/s
Explanation:
Speed is defined as the distance covered per unit time. Therefore, s=d÷t=d/t
Where d is distance and t is time
Given distance of 5 km and time of 21 minutes the speed would be given by dividing 5 km by 21 min. However, speed is expressed as km/h or m/s or miles per hour etc. So we nees to get our speed in one of these standard units.
Going for m/s
Conversion
1 km has 1000m hence
5 km=5*1000=5000m
1 min has 60 seconds hence
21 min=21*60=1260 s
Speed=5000m÷1260s=3.9682539682538 m/s
Rounded off, s=3.97 m/s
The speed at which the rider is spinning when the floor drops out beneath her is 5.42 m/s.
<h3>
Acceleration of the rider </h3>
The acceleration of the rider when the normal force is half their weight is calculated as follows;
Fn = 0.5(W)
ma = 0.5 x mg
65 x a = 0.5 x 65 x 9.8
a = 0.5 x 9.8
a = 4.9 m/s²
<h3>Speed of the rider</h3>
a = v²/r
v² = ar
v = √ar
v = √(4.9 x 6)
v = 5.42 m/s
Learn more about speed here: brainly.com/question/6504879
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I’m 95% sure it’s covalent bonds.
