Mass of this book is 1 kg.
Answer:
u = 88.54 m/s
Explanation:
Given that,
A discus thrower achieves a high throw of 100 m.
Angle of projection is 30°
We need to find the initial speed of the discuss. It is a cse of projectile motion. The maximum height reached by the discus is given by :

u is the initial speed of the discus
So,

So, the initial speed of the discus is 88.54 m/s.
The magnitude of force acting on the body is 36N
Answer:
The first trophic level of the food chain has the most energy.
Explanation:
time spent to run from house to school=100/5=20s
time spent to return from school=100/10=10s
average velocity=200m/(10+20)