A car starts from rest and speeds up at 2.2m/s^2 after the traffic light turns green , how far will it have gone when it os trav
1 answer:
73.6m
Explanation:
Initial velocity, U = 0
moving velocity, V = 18m/s
Acceleration = 2.2m/s²
Unknown:
Distance covered = ?
Solution:
we have to use the appropriate equation of motion to solve this problem
V² = U² +2as
V is the final velocity
U is the initial velocity
a is the acceleration
s is the distance
since u = 0
V² = 2as
18² = 2 x 2.2 x s
324 = 4.4s
s = = 73.6m
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final velocity is given as
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now acceleration is rate of change in velocity
so the acceleration of the car is 3 m/s^2
Answer:
Acceleration will increase.
Explanation:
The relation between force, mass and acceleration according to the Newton's second law of motion is given as:
F = ma
We are given that the driving force on the truck remains constant, so F is constant here. We can rewrite the above equation as:
Since, F is constant, the acceleration of the truck is inversely proportional to the mass.
There is a hole at the bottom of the truck through which the sand is being lost at a constant rate. Since, the sand is being lost, the overall mass of the truck is being reduced.
Since, the acceleration of the truck is inversely proportional to the mass, the reduced mass will result in an increased acceleration.
So, the acceleration of the truck will increase.