E=mgh. 196=5kg*9.81m/s^2*h. So h=196/(5*9.81)=4m
A. because as the merry-go-round spins the child accelerates towards the center of the merry-go-round at a uniform rate.
<u>Answer:</u>
The acceleration of the car is 
<u>Explanation:</u>
In the question it is given that car initially heads north with a velocity
. It then accelerates for
and in the end its velocity is
.
initial velocity 
time 
final velocity 
The equation of acceleration is


The value of acceleration is positive, here since the car is speeding up. If it was slowing down the value of acceleration would be negative.