Answer:
a) 
b) 
Explanation:
Given:
- speed of rocket initially,

- top speed of rocket after acceleration,

- time taken to get to the top speed,

- final speed of the rocket,

- time taken to get to the final speed after reaching the top speed,

Now the acceleration:



Now as a fraction of gravity:


Now, the deceleration:


Now as a fraction of gravity:


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Pacemaker........................................................
Answer:
Acceleration due to gravity will be 
Explanation:
We have given length of pendulum l = 55 cm = 0.55 m
It is given that pendulum completed 100 swings in 145 sec
So time taken by pendulum for 1 swing 
We have to find the acceleration due to gravity at that point
We know that time period of pendulum;um is given by

So 

Squaring both side


So acceleration due to gravity will be 
Answer:
<h3>The answer is option B</h3>
Explanation:
The frequency of a wave can be found by using the formula

where
c is the velocity
From the question
wavelength = 0.39 m
c = 86 m/s
We have

We have the final answer as
<h3>200 Hz</h3>
Hope this helps you