4. A sports car accelerates from rest to a final velocity of 64 m/s at a rate of 12.3 m/s2. How much time did it take the car to reach its final velocity?
A. 3.7 s
B. 4.8 s
C. 4.9 s

Step-by-step explanation:

Given

--- acceleration

--- final velocity

--- initial velocity (it is 0, because the car starts from rest)

Required

Determine the time taken

This will be solved using Newton's first equation of motion:

Substitute values for v, u and a

Make t the subject

Hence, the time taken is approximately 5.2 seconds

13

step-by-step explanation:

distance formula is d=√(x2-x1)^2   +   (y2-y1)^2

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24