Answer:
Force = mass × acceleration
Acceleration:

From first Newton's equation of motion:

Change = v - u:

Water cycle, evaporation, condensation, and freezing
Answer:
a) 0.31 rad/s
b) 100 J
c) 6.67 W
Explanation:
(a) the force would generate a torque of:

According to Newton 2nd law, the angular acceleration would be

It starts from rest, then after 15s it would achieve a speed of

(b) The distance angle swept by it is:

Hence the work by the child

c) Average power to work per time unit

Jennifer
Explanation:
she has more mass which means she is using more force
Answer:
a = 9.8 m/s²
Explanation:
Acceleration due to gravity on Earth is constant, which is 9.8 m/s²