Kendra loves rolling down hills. She finds a steep hill to roll down. As she is rolling, when is her kinetic energy most likely the highest?
at the bottom of the hill just as she has stopped rolling
just after the top of the hill right as she starts rolling down the hill
at the top of the hill right before she has started rolling down the hill
at the bottom of the hill right before she stops rolling
The correct answer is at the bottom of the hill just as she has stopped rolling. At this point, all of her potential energy from being at the top of the hill has been converted to kinetic energy as she rolls down the hill. As she reaches the bottom and comes to a stop, her kinetic energy is at its highest.
Two cars in motion have equal mass. Which car has more kinetic energy? (1 point)
Responses
the car with the greatest size
the car with the greatest size
the car with the greatest volume
the car with the greatest volume
the car with the greatest acceleration
the car with the greatest acceleration
the car with the greatest speed
Kendra's kinetic energy is most likely the highest at the bottom of the hill just as she has stopped rolling.
To determine when Kendra's kinetic energy is most likely the highest, we need to understand the concept of kinetic energy and its relationship with the position and speed of an object.
Kinetic energy is the energy possessed by an object due to its motion. It is given by the equation: K.E. = 1/2 * mass * velocity^2.
At the bottom of the hill just as she has stopped rolling, Kendra's velocity would be zero since she has come to a stop. Therefore, her kinetic energy at this point would also be zero.
Just after the top of the hill right as she starts rolling down the hill, Kendra's velocity would be at its highest since it's the start of her descent. Since kinetic energy is dependent on the square of the velocity, her kinetic energy would be the highest at this point.
At the top of the hill right before she has started rolling down the hill, Kendra's velocity would be zero since she has not yet started rolling down. Therefore, her kinetic energy at this point would also be zero.
At the bottom of the hill right before she stops rolling, Kendra's velocity will decrease as she approaches a stop. Therefore, her kinetic energy at this point would be lower than when she just started rolling down the hill.
So, the correct answer is: Kendra's kinetic energy is most likely the highest just after the top of the hill, right as she starts rolling down the hill.