Question

PLEEEEEAAASSSEEE HELP ME

1.On a hike you walk 5,000 m East, 3,000 m North, and 1,000 m West at a constant speed of 1 m/s. Calculate your velocity.(1 point)

A.0.44 m/s East + 0.33 m/s North

B.1.0 m/s

C.1.0 m/s East + 1.0 m/s North

D.0.55 m/s
2. You ride your bike at a constant speed of 5 ms for 300 s from your house to the mailbox. What was your acceleration for the trip?(1 point)

A.0 ms2

B.5 ms2

C.60 ms2

D.300 s
3. When evaluating the speed of an Olympic sprinter, we only need to know the length of the race and the elapsed time because speed is _________?
A. a scalar calculated as distance divided by time.

B.a vector calculated as displacement divided by time.

C.a scalar calculated as the time divided by the distance.

D.the elapsed time.
4. On a trip you travel at a constant speed of 50 kilometers per hour North for 1 hour. Then you turn West and travel at a constant speed of 40 kilometers per hour for 2 hours. Calculate your velocity for the trip.(1 point)

A.43 km per hour

B.31 km per hour

C.50 km per hour North + 40 km per hour West

D.27 km per hour West + 17 km per hour North

Answer 1

1) A. 0.44 m/s East + 0.33 m/s North

2) A. 0 m/s²

3) A. a scalar calculated as distance divided by time.

4) B. 31 km per hour

Step-by-step explanation:

1) Velocity is DISPLACEMENT over time.

at 1 m/s, total time of walking is 9000 seconds

displacement is 3000 m north and 5000 - 1000 = 4000 m east

4000 m/ 9000 s = 0.44 m/s E

3000 m/ 9000s = 0.33 m/s N

2) constant speed means no acceleration

3) A. a scalar calculated as distance divided by time.

4) displacement 50 km N and 80 km W

v = √(50² + 80²) / (1 + 2) = 31.446603... km/hr