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Answer 1:- Horizontal range of projectile is called distance.
= 341 meter
Yes it is true to say that a projectile has zero acceleration at its peak.
Because when a projectile is incline in upward direction with velocity when projectile reaches at its peak height then for a while before start decline its velocity becomes zero, so by becoming zero velocity its acceleration is also zero at its peak. (Because Acceleration is rate of change of velocity).
Answer 3 (a):-
Around a circular track velocity is changes because its direction is changes.
Speed and velocity are not the same things, so direction is integral part of the velocity, whereas speed is only defined by a quantity a number. In speed we can say how fast something goes but not to were
On the other hand velocity has to say how fast and which way.
Answer 3 (b):-
Momentum is product of mass of an object and velocity of an object.
So = mv
For 1st object
m = 1kg
v = 2m/s
So momentum of 1st object
= 1 x 2
= 2 N.sec
Now we calculate momentum of 2nd object
= 2 x 1
= 2 N.sec
Hence we prove that momentum of both objects is identical.