First slide

Position Path Length (Distance) And Displacement

Question

Balls are thrown vertically upward in such a way that the next ball in thrown when the previous one is at the maximum height. If the maximum height is 5-m, the number of balls thrown per minute will be (take g =10 m/s²)

Easy

A

40
B

50
C

60
D

120

Solution

The time taken by each ball to reach upto the heights point
$t = \sqrt{(\frac{2 h}{g})} = \sqrt{(\frac{2 \times 5}{10})} = 1 \sec$
Time interval between two balls = 1 sec
So, the number of balls thrown per minute = 1. x 60 = 60

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