Option A 3......
... ........
Answer:
Explanation:
average speed is distance traveled over time
v = (50 + 30(1.5)) / (2 + 1.5) = 27.1428571...
v = 27 km/hr
Answer: 1) t=0.5 s; S=6.225 m and v=14.9 m/s
2) t=1 s; S=14.9 m and v=19.8 m/s
3) t=1.5 s; S=26.05 m and v=24.7 m/s
Explanation:
The displacement
is given by

and final velocity
is given by

where
is the initial velocity
is acceleration
is time taken
Case 1: when time is 0.5 s
The displacement is

the velocity is

Case 2: when t=1 sec
The displacement is

the velocity is

Case 3: t=1.5 s
The displacement is

the velocity is

Answer: F = 32 N
Explanation:
F= m x a
m = 8 kg
a = 4 m/s²
F = 8 kg x 4 m/s² = 32 kg m /s² = 32 Newton
You'll never get the correct answer without the correct conversion factor. Note carefully that you have no decimal. It should be
<span>1 km = 0.6214 miles </span>
<span>1000 m = 1 km </span>
<span>60 seconds = 1 minute </span>
<span>60 minutes = 1 hour. </span>
<span>2.998E8 m/s x (1 km/1000m) x (0.6214 miles/km) x (60 sec/min) x (60 min/hr) = ?</span>