A particle is projected at an angle alpha with the horizontal from the foot of an inclined plane making an angle beta with horizontal . Which of the following expressions holds good if the particle strikes the inclined plane normally?

A particle is projected at an angle alpha with the horizontal from the

1.	A particle is projected at an angle alpha with the horizontal from the foot of an inclined plane making an angle beta with horizontal . Which of the following expressions holds good if the particle strikes the inclined plane normally?
Answer» `COT beta=-tan (alpha-beta)` `cot beta=2 tan (alpha-beta)` `cot alpha=tan (alpha-beta)` `cot alpha=2tan (alpha-beta)` SOLUTION :If the particle strikes NORMALLY then `v_(X)=0` `v_(x)=u_(x)-g cos BETAT` `T=(2 u sin (alpha-beta))/(g cos beta)`