Just after vertical launch from earth surface, the space shuttle takes 8.0 s to reach a speed of 160 km/h. during this phase, what is the apparent weight of an 84 kg astronaut?

1291.08 N

Explanation:

acceleration=change in speed per unit time

where v and u are final and initial velocities respectively.

u is zero and v=160 km/h converted to m/s becomes

acceleration=

Apparent weight,

Taking g as 9.81 and m as 84 Kg then

  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.