C and if you think A your wrong because sunscreen can block 100% of sun unless you coated on to the point of your entire body
Answer:
(a i - 2a j) / 2
Explanation:
a1 = a i
a2 = a j
a3 = - (i + j) (2a) = - 2a i - 2a j
a4 = (i - j) (3a) = 3a i - 3a j
Let the mass of each particle is m.
Use the formula of acceleration of centre of mass
a cm = (m1 a1 + m2 a2 + m3 a3 + m4 a4) / (m1 + m2 + m3 + m4)
a cm = (a i + aj - 2a i - 2a j + 3a i - 3a j) / 4
a cm = ( 2a i - 4a j) / 4
a cm = (a i - 2a j) / 2
Answer:
Explanation:
Given the following data;
Distance = 46 km
Time = 11 minutes
To find the average speed;
Speed = distance/time
1.
63-48
= 15 ml
Since the water rises 15 ml in the graduated cylinder, its volume is 15 ml^3
2. 43 -36
=7ml^3