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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B It increases.
In fact, the kinetic energy of a moving object is given by
where m is the mass of the object and v is its speed. We see that the kinetic energy is proportional to the mass and proportional to the square of the speed: in this problem, the speed of the object remains the same, while its mass increases, therefore the kinetic energy will increase as well.
B It increases.
In fact, the kinetic energy of a moving object is given by
where m is the mass of the object and v is its speed. We see that the kinetic energy is proportional to the mass and proportional to the square of the speed: in this problem, the speed of the object remains the same, while its mass increases, therefore the kinetic energy will increase as well.