A student performs an experiment and must measure the lengths of four different objects: a textbook, a pencil, a cup, and a piec
2 answers:
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To solve this problem we will apply the linear motion kinematic equations, which describe the change in velocity, depending on the acceleration and the distance traveled, that is,
Where,
= Final Velocity
= Initial Velocity
a = Acceleration
h = height
Our values are given as,
Replacing we have,
Therefore the height of the cliff is 121ft
Answer:
the answer is A.) -1 * 10^3[N]
Explanation:
The solution consists of two steps, the first step is using the following kinematic equation:
The initial velocity is 10 [m/s], and the final velocity is zero because the car stops in 0.5[s].
Replacing:
Now in the second part, we need to use the second law of Newton, this law relates the forces with the acceleration of a body.
In the moment when the car stops suddenly the driver will feel the force of the seatbelt acting in the opposite direction of the movement.
The minus sign means that the force is acting in the opposite direction of the movement.