Because acceleration depends not only on the change in velocity.
It also depends on the time during which the change occurs.
The formula is
Acceleration = (change in velocity) divided by (time for the change) .
Maybe Sla changed his velocity in 3 seconds, but Hazel
took all morning to change hers. In that case, even though
the amounts of change were equal, the times were different,
so the quotients of (change/time) were different.
Answer:
1.89*10⁶J
Explanation:
because 4500kg * 42m*10m/s² is 1890000J
Answer:
52,94N
Explanation:
Frictional force is the opposing force that is created between two surfaces that try to move in the same direction or that try to move in opposite directions. The main purpose of a frictional force is to create resistance to the motion of one surface over the other surface.
Calculation:
Le the value of frictional force be Fk, therefore acceleration a = (F- Fk)/m
where :
F is the applied force
m the mass of the cart
a = (F- Fk)/m = 0.8
F - Fk = 0.8m
Fk = F - 0.8m
Fk = 56.3 - (0.8×4.2)
Fk = 52.94 N
The magnitude, in Newtons, of the net frictional force is therefore 52.94N