force x distance = 50 x 15 = 750 joules
work against friction goes to heat warmer
The seat belt counteracts newtons Newton's law is by preventing an object that is in motion to keep going. This is an example of Newton's First Law which when an object that is in motion stays in motion unless an unbalanced forces acts on it, and in this scenario the seat belt.
Answer:
Find the answer in the explanation
Explanation:
Given that a ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically upward from ground level, such that it has zero speed when it reaches the top of the building.
a. When do the two balls pass each other?
The the balls will pass each other before the second ball reach half of the height of the building. Because the velocity of the second ball decreases as it goes upwards while the velocity of the first ball increases as it moves downwards
b. Which ball has greater speed when they are passing?
The first ball of course because the velocity of the second ball decreases as it goes upwards while the velocity of the first ball increases as it moves downwards
c. What is the height of the two balls when they are passing?
Taking the height from the bottom of the building upward
Since the two balls meet at a certain point, they will both have the same height.
<span>The acceleration of an object is equal to the change in velocity over time. Or alternatively, the acceleration of an object is equal to the initial velocity minus the final velocity over the time taken to change from the initial velocity to the final velocity.</span>
Acceleration = speed/ time
a = Δv/Δ t
as Δv = v₂ - v₁ / t
a = 50m /s - 0 m/s / 60m
= 50m/s / 60m
= 0.834s⁻¹
