Question

The velocity-time graph of a ball moving on the surface of a floor in shown in the figure. Find the force acting on the ball if its mass is 50g.​

Answer 1

Answer:

answer is 10 is force acting on ball

Answer 2

Answer:

−0.25N

Explanation:

Solution

The velocity time graph shows that velocity of the ball at t=0 is 30ms−1

That is, initial velocity of the ball u=30ms−1

That is final velocity of the ball v=0

Step 1: Acceleration of the ball

a=v−u/t

=0−30ms−/6s=5ms−2

Negative sign shows that the motion of the ball is retarded

Step 2: Also mass of ball

m=50g=50/1000=1/20kg

Force acting on the ball F=ma

=(1/20kg)(−5ms−2)=−0.25kgms−2

=−0.25N

Negative sign shows that the force is acting on the ball in a direction opposite to the direction of the motion of the ball. Such force is known as retarding force or opposite force.