Danger Time

A terrorist places a bomb at a horizontal distance of $6 m$ from the foot of building of height $8 m$ . When the bomb explodes its fragments fly in all direction with a velocity of $20 m/s$ . The man on the top of the building will be in danger for a period of time $t = a \sqrt \frac {11}{5}$ .Find the value of $100 \times a$

Details :

• All particles after explotion falls under gravity. All other force are neglected.

• $g= 10 m/s^2$

• $t$ the time period in which man will be in danger not not the value of time.