Speed of an object is kinetic energy
Answer:
V=15.3 m/s
Explanation:
To solve this problem, we have to use the energy conservation theorem:

the elastic potencial energy is given by:

The work is defined as:

this work is negative because is opposite to the movement.
The gravitational potencial energy at 2.5 m aboves is given by:

the gravitational potential energy at the ground and the kinetic energy at the begining are 0.

Answer:
We conclude that the force on the bag is 500 N.
Explanation:
Given
- Acceleration a = 0.5 m/s²
To determine
Force F = ?
We know that when a force is applied to a body, it produces acceleration.
<u>Important Tip: </u>
- We can determine the force on the bag using the formula F = ma
Using the formula

where
is the force
is the mass
is the acceleration
now substitute m = 1000, and a = 0.5 m/s² in the formula


N
Therefore, we conclude that the force on the bag is 500 N.
Answer:
Part a)

Part b)

Part c)

Part d)

Explanation:
As we know that he start from rest and moves with uniform acceleration
so here we can say that

as we know here that he move with uniform speed from t = 7 to t = 11
So we will have


Part b)
If Donald runs for 3 s after reaching his maximum speed
So here distance moved by Donald


Part c)
Distance of Donald from start line is given as


Part d)
Distance from start line after t = 8.5 s


