Question

PHYSICS HELP PLEASE!! MUST SHOW MATH WORK!!

1. How far will a bird have traveled in 13 seconds if it maintained a speed of 31 m/s?




2. Ian walks 2 km to his best friend’s house, then walks 0.5 km to the library. He then makes a 2.5 km walk home. The entire walk took him 3 hours. What is his average speed in km/h?




3. A truck speeds up from a velocity of 6 m/s to 14 m/s in 4 seconds. What is the truck’s acceleration?

Answer 1

1) Distance traveled by bird = 403 meter

2)Average speed = 1.66 km /hour

3) Zcceleration = 2
`m/s^2`

Step-by-step explanation:

1) Distance traveled = Speed * Time taken = 31 * 13 = 403 meter.

2) Average speed = Total distance covered / Time taken for that distance to cover.

Total distance covered = 2+0.5+2.5 = 5 km

Time taken = 3 hours

Average speed = 5/3 = 1.66 km /hour

3) Acceleration is defined as the rate of change of velocity, so acceleration a = change in velocity/time.

Change in velocity = 14 - 6 = 8 m/s

Time = 4 seconds

So acceleration = 8 / 4 = 2
`m/s^2`