Answer:

Explanation:
Missing question:
What is the object's acceleration?
Solution:
The acceleration of an object is given by

where
v is the final velocity
u is the initial velocity
t is the time taken for the change in velocity
For the object in this problem,
u = +25 m/s
v = +15 m/s
t = 2.0 s
Substituting,

And the acceleration is negative because its direction is opposite to that of the velocity.
You are correct earth science is studied to predict planetery changes
Answer:
Explanation:
Given
Initial angular velocity 
Initial speed 
Coefficient of kinetic friction 
As No external torque is applied therefore angular momentum is conserved


For rolling without slipping 



acceleration provided by surface



Speed of ball after 
using 
v=final velocity
u=initial velocity



thus 
