A4-kg ball has a momentum of 12 kg. m/ s. what is the ball's speed?

a. 3 m/s
b. 4 m/s
c. 12 m/s
d. 48 m/s
e. none of these

a. 3 m/s

Explanation:

The magnitude of the momentum of an object is given by:

where

m is the mass of the object

v is the speed of the object

For the ball in this problem, we know:

p = 12 kg m/s is the momentum

m = 4 kg is the mass

Solving the equation for v, the speed, we find:

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.