Question

A bullet is projected upwards from the top of a tower height 90m with the velocity 30m/s
making an angle 30° with the horizontal.The time taken by it to reach the ground is

Answer 1

Answer:

6 sec

Explanation:

A bullet is projected upwards from the top of a tower height 90m with the velocity 30m/s making an angle 30° with the horizontal.The time taken by it to reach the ground is

Horizontal Velcoity = 30Cos30 = 15√3 m/s

Vertical Velcoity = 30Sin30 = 15 m/s

Time taken to reach at top  using V = U + at

=> 0 = 15 -10*t

=> t = 1.5 sec

Vertical Distance Covered = 15*1.5 - (1/2)(10)1.5² = 11.25 m

Height = 90 + 11.25 = 101.25

Time to Reach groung

101,25 = (1/2)(10)t²

=> t = 4.5 sec

Total Time of Travel = 1.5 + 4.5 = 6 sec

.The time taken by it to reach the ground is 6 sec

Answer 2

Explanation:

this is the answer for the question