Answer:
A) 9000 Joules
B) 450 Watts
Explanation:
Work equals change in energy:
W = ΔPE
W = mgΔh
W = (600 N) (15 m)
W = 9000 J
Power is work per time:
P = W/t
P = (9000 J) / (20 s)
P = 450 W
The net force acting on the object perpendicular to the table is
∑ F[perp] = F[normal] - mg = 0
where mg is the weight of the object. Then
F[normal] = mg = (15 kg) (9.8 m/s²) = 147 N
The maximum magnitude of static friction is then
0.40 F[normal] = 58.8 N
which means the applied 40 N force is not enough to make the object start to move. So the object has zero acceleration and does not move.
Answer: The foot kicked the ball with alot of force the ball had force too so their toes are left stinging
Explanation: