How much time of cardio activity is recommended for kids and teens by the CDC? A.
60 minutes every day of the week
B.
60 minutes each week
C.
15 minutes every day of the week
D.
30 minutes twice a week

the answer is A

Explanation: cause i took the test and i got it right

2.5 m/s²

Explanation:

Given,

Initial speed ( u ) = 10 m/s

Final speed ( v ) = 20 m/s

Time ( t ) = 4 seconds

To find : Acceleration ( a ) = ?

Formula : -

a = ( v - u ) / t

a = ( 20 - 10 ) / 4

= 10 / 4

= 5 / 2

a = 2.5 m/s²

Therefore,

The acceleration of the scooter is 2.5 m/s²