FAST balls

A lamp is 50 ft.above the ground.A ball is dropped from the same height from a point 30 ft.away from the light pole.If ball falls a distance s=16t^(2) ft.in t second,then how fast is the shadow of the ball moving along the ground (1)/(2)s later?

Three are 8 brown balls ,4 orange balls and 5 blacks balls in a bag .Five balls are chosen at random. What is the probability of their being 2 brown balls ,I orange ball and 2 black balls ?

An urn contains 5 red and 2 green balls. A ball is drawn at random from the urn. If the drawn ball is green, then a red ball is added to the urn and if the drawn ball is red, then a green ball is added to the urn, the original ball is not returned to the urn. Now, a second ball is drawn at random from it. The probability that the second ball is red is

If two ping-pong balls are suspended near each other and a fast stream of air is produced in the space between the balls, then the ball

A ball is dropped from the top of a building. The ball takes 0.50 s to fall past the 3m length of a window, which is some distance below the top of the building. (a) How fast was the ball going as it passed the top of the window? (b) How far is the top of the window from the point at which the ball was dropped? Assume acceleration g in free fall due to gravity to be 10 m//s^(2) downwards.

In a second ODI match between England and India Bhuwnesh kumar bowled his medium fast bowling. He starts his run up from the distance of 50m from the stumps (bowling end) and at the time of bowling a ball,his speed is 36(km)//(hr) and the speed of ball is 144(km)//(hr) . If his mass is 70 kg and mass of the ball is (1)/(4)kg and the heat produce in his body is one tenth of the total work done by him, then Energy spent by bowler in throwing one ball is :-

A bag contains 7 green, 10 blue and 5 red balls. A ball is drawn at random. Find the probability of this ball being a: (i) blue ball. (ii) red ball or a green ball. (iii) not a green ball.

A bag contains 3 red, balls, 4 bule balls and 5 green balls .What is the probability that a ball picked up at random is not a blue ball ?