Answer:
Purplemath
The first term in the binomial is "x2", the second term in "3", and the power n is 6, so, counting ... x12 + 18x10 + 135x8 + 540x6 + 1215x4 + 1458x2 + 729 ... So memorize the Theorem and get the easy points.
Answer:
c. V = k Q1 * Q2 / R1 potential energy of Q1 and Q2 separated by R
V2 / V1 = (R1 / R2) = 1/4
V2 = V1 / 4
Answer:
Total time to complete the race = 45 sec
Explanation:
We have given that each lap is 60 m long
Average speed for the first lap = 2 m/sec
So time taken to complete the first lap 
Average speed for second lap = 2 m/sec
So time taken to cover the second lap 
So total time to complete the race = 30 +15 =45 sec