A sphere has reflection symmetry across any plane through its center.
Answer:
v = 21.25 km/h
The average velocity is 21.25km/h
Explanation:
Average velocity = total displacement/time taken
v = d/t
Given;
A car travels 50 km in 25 km /h
d1 = 50km
v1 = 25km/h
time taken = distance/velocity
t1 = d1/v1
t1 = 50/25 = 2 hours
and then travels 60km with a velocity 20 km/h
d2 = 60km
v2 = 20km/h
t2 = d2/v2 = 60/20
t2 = 3 hours
and then travels 60km with a velocity 20 km/h in the same direction
d3 = 60km
v3 = 20km/h
t3 = d3/v3 = 60/20
t3 = 3 hours
Average velocity = total displacement/total time taken
v = (d1+d2+d3)/(t1+t2+t3)
v = (50+60+60)/(2+3+3)
v = 170/8
v = 21.25 km/h
The average velocity is 21.25km/h
Answer:
The center of mass can be calculated by taking the masses you are trying to find the center of mass between and multiplying them by their positions
Answer:
D
Explanation:
They looked at her hand and made a formal conclusion from that
Answer:
Explanation:
We are given that
Mass of box=60kg
Net external force applied on the box=90 N
Friction force =30N
We have to find the acceleration of the box.
We know that
Net external force=ma
Substitute the values then we get
Hence, option b is true.
