Answer: 42 N-s
Explanation: The area under the curve is equal to the impulse, so you take the area of the two triangles and add it to the area of the rectangle.
Area of a triangle: 1/2bh
Area of a rectangle: bxh
2(1/2x2x7)=14+(4x7)=42 N-s
Choice-A is the main reason that people use the thing in the picture.
Answer:
It cannot be changed
Explanation:
The freezing point of water cannot be changed; it stays the same.
Answer:
(1) 3.0 dm
Explanation:
Due to the law of conservation of energy, the initial gravitational potential energy of the object will be all converted into elastic potential energy of the spring as the object hits the spring:

where
m = 4.0 kg is the mass of the object
g = 9.8 m/s^2 is the acceleration due to gravity
h = 1.0 m is the initial height of the object
k = 850 N/m is the spring constant
x is the compression of the spring
Solving the equation for x, we find:
