The ball's horizontal component of velocity (ie it's horizontal speed) is 20 cos 40degrees. Without knowing the distance of the ball to the wall it's difficult to go further ...
Answer:
36,000j
Explanation:
W= P•t
120•300= 36000
I checked my answer with P= W/t and got the right answer
hope this helps
Answer:
force of gravity; weight
Explanation:
Weight is the force of gravity on an object and it is measured in Newtons. On this spring scale, each line equals one Newton.
The initial kinetic energy of the boat and its rider is
After Sam stops it, the final kinetic energy of the boat+rider is
because its final velocity is zero.
For the law of conservation of energy, the work done by Sam is the variation of kinetic energy of the system:
where the negative sign is due to the fact that the force Sam is applying goes against the direction of motion of the boat.