Answer:
Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).
They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).
In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.
First put the speed in m/s. 120km/h = 33.33m/s. Now the position function is the integral of velocity, and velocity is in turn the integral of acceleration. The velocity is:

Now we integrate this expression to get the position. The constant of integration will be the distance the truck travels.

Here we set the distance, 35m as negative because I assumed the stopping point of the truck is the origin. Putting t=0 shows it starts at -35m.
Now solve the following equation for the time, t using the quadratic equation:

and choose the value t=1.149s
Answer:
At momentum zero, kinetic energy = zero
At momentum 10, kinetic energy can never be equal to zero.
Explanation:
An object is said to have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and this case, the object must be at rest. Momentum is zero when change in velocity is zero, but kinetic can never be zero when body is motion or has a momentum of 10.
Answer:
400 feet would be the correct answer
Hope it helped :3
Given parameters:
Mass of load = 20kg
Height of man = 1.4m
Unknown:
Work done by man = ?
Work done is the force applied to move a body in a particular direction.
Often times, it is mathematically expressed as;
Work done = Force x distance
In this problem, we use the formula of potential energy to find the work done;
Work done = Potential energy = mgh
where m is the mass of the load
g is the acceleration due to gravity = 9.8m/s²
h is the height of the body
Now, input the parameters, and solve for work done;
Work done = 20 x 9.8 x 1.4 = 274.4J
The work done by man is 274.4J