Two friends are each driving a car down Highway 101. During a particular 10 s interval, Jodi's car moves at a constant 60 mph. D
1 answer:
Answer:
Julie's car.
Explanation:
The acceleration of an object is equal to the rate of change of velocity. It can be given by :
Jodi's car moves at a constant 60 mph for 10 s.
Julie's car transitions from a speed of 20 mph to a speed of 30 mph for the same time interval i.e. 10 s.
For Jodi's car, the change in velocity is equal to 0. As a result, its acceleration is equal to 0 m/s².
For Julie's car,
Initial speed, u = 20 mph = 8.9408 m/s
Final speed, v = 30 mph = 13.4112 m/s
Acceleration,
It is clear that Julie's car has the greater acceleration than the Jodi's car.
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Answer:
1) The greatest height attained by the ball equals 20.387 meters.
2) The time it takes for the ball to reach 15 meters approximately equals 1 second.
Explanation:
The greatest height will be attained when the ball stop's in the air and starts falling back to the earth.
thus using third equation of kinematics we obtain the height attained as
where
'v' is the final speed of the ball
'u' is the initial speed of the ball
'a' is the acceleration that the ball is under which in this case equals 9.81
's' is the distance it covers
Thus for maximum height applying the values in the equation we get
Using the same equation we can find the speed of the ball when it reaches 15 meters of height as
the time it takes to reduce the velocity to this value can be found by first equation of kinematics as