Question

Please help me in solving this question

Answer 1

F=ma
This will be the process to solve this question

Answer 2

according to the v-t graph

V1 = initial velocity = 20cm/s

t1 = initial time = 0

V2 = final velocity = 0cm/s

t2 = final Time = 10

acceleration :- The rate of change in velocity.

(slope of the v-t graph given acceleration )

(slope of the x-t(position-time) graph give velocity)

(area of the a-t graph give distance)

a = ∆v/∆t

a = v2-v1/T2-T1

a = 0-20/10-0

a = -20/10

a = -2cm/s².

F = ma

F = 20g × -2cm/s²

F = -40gcm/s²

F = -40dyne

F = -40 × 10^-5 N

(Here - sign shows foce(i.e friction) is acting opposite of the motion of the ball it also shows force is a vector quantity)