Mass is the actual amount of material contained in a body and is measured by kg, gm, etc. Whereas weight is the force extorted by the gravity on that object mg. Note that mass is independent of everything but weight is different on earth, moon, etc.
Here it is given that speed of the dog will increase from 5 m/s to 11 m/s in order to cover the distance of 22 m
so here we can use kinematics to find the acceleration



now we will have




so here it will accelerate with a = 2.18 m/s^2
Answer:
Part (i) the initial acceleration of the rocket is 6.98 m/s²
Part(ii) the floor pushes on the power supply at 120m altitude by a force of 31.68 N
Explanation:
Part (i) the initial acceleration of the rocket.
For the rocket to accelerate, the force applied to it must overcome gravitational force due to its own weight.

Part(ii) how hard the floor pushes on the power supply at 120 m altitude
At 120 m height, the acceleration of the rocket is 6.98 m/s², which is the same as the power supply.
given force on power supply;
F = 18.5 N
Applying Newton's second law of motion, the mass of the power supply = 18.5/9.8
= 1.888 kg
The force on power supply at this altitude = m(a+g)
= 1.888(6.98 +9.8)
= 1.888(16.78)
= 31.68 N
Therefore, the floor pushes on the power supply at 120 m altitude by a force of 31.68 N
the answer is bond energy but I am not pretty sure
The car travels a distance <em>d</em> from rest with acceleration <em>a</em> after time <em>t</em> of
<em>d</em> = 1/2 <em>a</em> <em>t</em>²
It covers 69 m with 2.8 m/s² acceleration, so that
69 m = 1/2 (2.8 m/s²) <em>t</em>²
<em>t</em>² = 2 (69 m) / (2.8 m/s²)
<em>t</em> ≈ 7.02 s
where we take the positive square root because we're talking about time *after* the car begins accelerating.