Answer:
-929.5Joules
Explanation:
To get the work done by sam, we will calculate the kinetic energy of sam expressed as;
KE = 1/2mv²
m is the mass = 1100kg
v is the velocity = 1.3m/s
KE = 1/2(1100)(1.3)²
KE = 550(1.69)
KE = 929.5Joules
Since Sam is opposing the direction of movement, work done by him will be a negative work i.e -929.5Joules
Answer= D. Velocity includes a direction; speed does not.
Velocity and speed both have the same units of m/s, so answers A and B are wrong.
Velocity is a vector quantity and so has direction and magnitude, so C is wrong.
Speed is a scalar quantity, only having magnitude and no direction.
Answer:
Kinetic energy.
The explanation never existed
They are alike because there nuclear force is an attractive force between protons and neutrons that the nucleus