I will go to school tomorrow .....is this present tense or past tense or future tense
Answer:
a) 
b) 
Explanation:
From the question we are told that:
Velocity 
Time 
a)
Generally From Newton's motion equation for Average acceleration is mathematically given by

Since its from Rest Therefore



b)
Generally the equation for Average Velocity is mathematically given by







Answer:
Explanation:
Given
Original Frequency 
apparent Frequency 
There is change in frequency whenever source move relative to the observer.
From Doppler effect we can write as

where
apparent frequency
v=velocity of sound in the given media
velocity of source
velocity of observer
here 




i.e.fork acquired a velocity of 
distance traveled by fork is given by

where v=final velocity
u=initial velocity
a=acceleration
s=displacement



As we know that kinetic energy is given as

Here we can find the initial speed of puck A by momentum conservation



now here we will have initial kinetic energy of the mass is given as




now loss of energy is given as

The first one:
Like poles repel each other and opposite poles attract each other