What is the momentum of a 80-kg person moving at 5 m/s?
a. 16 kg. m/s
b. 80 kg. m/s
c. 400 kg. m/s
d. 3920 kg. m/s

PLEASEEE HEL

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

How many neutrons does plutonium -196 with an atomic number of 78.