I do not have that one but i think you can download that in the internet.
Answer:
Explanation:Assume you are lifting an object with mass 20 kg from the ground to a height of 1.5 m. Assume that you are exerting a constant force in the upward direction and that you are moving the object upward with uniform velocity. The net force on the object is zero. The force you are exerting is equal in magnitude and opposite in direction to the force of gravity. As you are lifting the object you are doing work on the object.
Answer:
0.0196J
Explanation:
KE equation is 1/2*m*v^2
when pluged in above numbers...
0.5*0.00245*4*4=0.0196J
<span>A joule is equal to one watt per second and so we must find out how many seconds are in two hours.
A shortcut you can use is remove the zeros and multiplying the remaining numbers before adding the the zeros back to the total of your result
6 x 6 x 2 = 72 and thus
60 x 60 x 2 = 7200
72 x 15 = 1080 and thus
7200 x 1500 = 10800000 joules
one mega joule equals one million joules
So we can simplify things and say 10.8 MJ</span>
Force can be calculated by the product of mass and the acceleration of the object in motion. Acceleration is the change of velocity per change in time. The expression would be:
F = ma
where
a = Δv/Δt
The object is from rest and time 0. Acceleration would reduce to:
a = v/t
F = m(v/t)
2000 = 100 (v / 0.3)
v = 6 m/s -------> OPTION 1
