Home
Class 9
PHYSICS
A ball of mass 0.5kg moving with a speed...

A ball of mass `0.5kg` moving with a speed of `10m//s` rebounds after striking normally a perfectly elastic wall. Find the change in momentum of the ball . If contact time with the wall is `0.1s`, what force is exerted by wall?

Text Solution

Verified by Experts

Here, `m =0.5 kg, u=m//s v=10m//s, dt=0.1s, F=?`
Change in momentum of ball,
`dp=m(v-u)=0.5(-10-10)= -10kg m//s`
`F=(dp)/(dt)=(-10)/(0.1)= -100N`
Negative sign indicates that force is in a direction opposite to the initial direction of motion of the ball.
Promotional Banner

Topper's Solved these Questions

  • FORCES AND LAWS OF MOTION

    PRADEEP|Exercise VALUE BASED QUESTIONS|4 Videos

  • FORCES AND LAWS OF MOTION

    PRADEEP|Exercise EXERCISE|24 Videos

  • FORCES AND LAWS OF MOTION

    PRADEEP|Exercise VERY SHORT ANSWER QUESTIONS|29 Videos

  • FLOTATION

    PRADEEP|Exercise Problem For Practice|6 Videos

  • GRAVITATION

    PRADEEP|Exercise Model Test paper (1)|36 Videos

Similar Questions

Explore conceptually related problems

A ball of 0.5 kg mass moving with a speed of 10 m//s rebounds after strinking normally a perfectly elastic wall . Find the change in momentum of the ball.

A ball of mass 0.5 kg moving with a velocity of 2 m//s strikes a wall normally and bounces back with the same speed . If the time of contact between the ball and the wall is 1 millisecond , the average force exerted by the wall on the ball is

A ball of mass 0*2 kg moving with a speed of 30 m/s strikes a bat returns in opposite direction with speed of 90m/s . Magnitude of change in momentu,m of ball will be

A ball of mass 3kg moving with a speed of 100 m/s, strikes a wall at an angle 60^(@) (as shown in figure). The ball rebounds at the same speed and remains in contact with the wall for 0.2 s, the force exerted by the ball on the wall is

A ball of mass 0.5 kg moving with a velocity of 2 ms^(-1) strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is

A ball of mass m moving with speed v towards the right strikes a wall moving towards the left with speed u . Find the change in the K.E. of the ball if the collision is elastic.

A ball of 0.1kg strikes a wall at right angle with a speed of 6 m/s and rebounds along its original path at 4 m/s. The change in momentum in Newton- sec is-

0A body of mass 20 kg moving with a velocity of 3 m//s, rebounds on a wall with same velocity. The impulse on the body is -