Answer:
10m/s
Explanation:
a = v- u/ t
=> v = at + u
= -2 × 5 + 20
= 10m/ s. ( 72 km/ h = 20 m/ s)
They didn't think the land was suitable for settlement.
Explanation:
Momentum = mass × velocity
p = mv
p = (1000 kg) (14 m/s)
p = 14000 kg m/s
Answer:
A) 9.8m/s this answer is correct.
The acceleration is increasing by 0.9m/s^2 .
so, in each second it will increase by 0.9m/s^2.
Therefore, in 2 second
0.9 * 2
= 1.8m/s
Now,
8 + 1.8
= 9.8m/s
Answer:
Explanation:
The original frequency of sound being emitted f₀ = 1800
Its velocity towards the observer v ( let )
Apparent frequency f = 2130
velocity of sound = V
Placing the given values
1.1833 =
1.1833 v = 62.87
v = 53.13 m /s .
b ) In the second case
formula for apparent frequency
Substituting the values
= 2458 Hz .