1) Average velocity: 19 mi/h
The average velocity is given by:
where
d is the displacement
t is the time taken
In this problem,
d = 3.8 mi is the displacement
is the time taken
Substituting,
Note that this is actually the average speed, not the average velocity, since there is no information about the direction of the motion.
2) 
The acceleration is given by
where we have
v = 28 mph is the final velocity
u = 18 mph is the initial velocity
t = 3.5 s is the time taken
Conerting the time from seconds to hours,
So the acceleration is
Answer:
Option B is correct
Explanation:
acceleration is equal to rate of change of velocity.
Answer:
50 ms⁻¹
Explanation:
Given that,
Distance Travelled =2000 meters
Time Taken =40 seconds
velocity = ?
we know,
velocity = Distance / Time
=(2000 / 40) ms⁻¹
=50 ms⁻¹
Answer:
Density = 1.1839 kg/m³
Mass = 227.3088 kg
Specific Gravity = 0.00118746 kg/m³
Explanation:
Room dimensions are 4 m, 6 m & 8 m. Thus, volume = 4 × 6 × 8 = 192 m³
Now, from tables, density of air at 25°C is 1.1839 kg/m³
Now formula for density is;
ρ = mass(m)/volume(v)
Plugging in the relevant values to give;
1.1839 = m/192
m = 227.3088 kg
Formula for specific gravity of air is;
S.G_air = density of air/density of water
From tables, density of water at 25°C is 997 kg/m³
S.G_air = 1.1839/997 = 0.00118746 kg/m³
