A ball of mass 1 kg moving with a velocity of 5 m//s collides elastically with rough ground at an angle theta with the vertical as shown in Fig. What can be the minimum coefficient of friction if ball rebounds vertically after collision? (given tantheta=2)

A ball of mass 1 kg moving with a velocity of 5 m//s collides elastica

1.	A ball of mass 1 kg moving with a velocity of 5 m//s collides elastically with rough ground at an angle theta with the vertical as shown in Fig. What can be the minimum coefficient of friction if ball rebounds vertically after collision? (given tantheta=2)
Answer» Solution :From impulse MOMENTUM THEOREM `intN dt=m(v+5costheta)`………….i `intf dt=m5sintheta` `muintN dt=m5sintheta`……..ii `impliesmum(v+5costheta)=m5sintheta` According to Newton's law of RESTITUTION `v=35costheta` SOLVE to GET `mu=1`