Answer:
Explanation:
v = u +at
u = 0
a = 2.3 m /s²
t = 20 s
v = 2.3 x 20
= 46 m /s
Distance covered under acceleration of 2.3 m/s²
s = ut + 1/2 at²
= 0 + .5 x 2.3 x 20²
= 460 m
After that it moves under free fall ie g acts on it downwards .
v² = u² - 2gh , h is height moved by it under free fall
0 = 46² - 2 x 9.8 h
h = 107.96 m
Total height attained
= 460 + 107.96
= 567.96 m
b ) At its highest point ,it stops so its velocity = 0
c ) rocket's acceleration at its highest point = g = 9.8 downwards .
At highest point , it is undergoing free fall so its acceleration = g
Answer:
Position of motorist = 33.8 m
position of police officer = 16.9 m
Explanation:
velocity of motorist, v = 13 m/s
initial velocity of police officer, u = 0
Acceleration of police officer, a = 5 m/s^2
let after time t, the velocity of police officer is equal to the velocity of motorist.
v = u + at
13 = 0 + 5 t
t = 2.6 second
Position of motorist after 2.6 second = v x t = 13 x 2.6 = 33.8 m
Position of police officer after t = 2.6 s
s = ut + 0.5 at^2
s = 0 + 0.5 x 5 x 2.6 x 2.6 = 16.9 m
Echo means repetition of sound..If someone is speaking there will be two sounds..one which he is speaking right now and the other sound which he/she spoke earlier ..this will lead to confusion..in big halls the distance would be more than 17 m between the walls which will cause echo and not reverberation(prolongation of sound)
Hope this helps!
Answer: 49.4g
Explanation:
Weight = 484N
Mass = ?
Recall that the weight of an object is a product of its mass (m) by gravitational acceleration (g). And g is a constant with value of 9.8 ms2
Thus, Weight = mg
484N = mass x 9.8 ms2
Mass = (484/9.8)
Mass = 49.388g
(Rounded to the nearest tenth, the mass becomes 49.4g)
Thus, your father is 49.4grams in mass
Explanation:
tomatoes and lemons when used together are acid forming.
processed foods and certain dairy products are acid forming.