A ball of mass 1 kg moving with a speed of 10 ms^(-1) reboundsafter a pefect elastic collision with the floor. Calculate the changein linear momentum of the ball.

A ball of mass 1 kg moving with a speed of 10 ms^(-1) reboundsafter a

1.	A ball of mass 1 kg moving with a speed of 10 ms^(-1) reboundsafter a pefect elastic collision with the floor. Calculate the changein linear momentum of the ball.
Answer» Solution :u=-20 cm f=10 cm `1/(f)=1/v-1/u` `1/v=1/(f)+1/u` `1/v=1/10+1/(-20)` `1/v=1/10-1/20` `v=1/20 rArr` v=20 cm Nature of the image REAL enlarged and inverted image. (II)Given : mass =1 kg , speed = `10 ms^(-1)` `therefore` INITIAL momentum = mu = 1 x 10 =10 kg `ms^(-1)` Final momentum = mv =- 10 `ms^(-1)` Change in momentum =final momentum - Initial momentum =mv-mu =-10-10 Change in momentum =-20 kg `ms^(-1)`