Question

# Two balls are thrown simultaneously, (A) vertically upwards with a speed of 20 m/s from the ground and (B) vertically downwards from the height of 40 m with the same speed and along the same line of motion. At which points the balls will collide? (take g=10m/s2)

A
15m above the ground
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
15m below from the top to the tower
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
C
20m above from the ground
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
D
20m below from the top to the tower
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
Open in App
Solution

## The correct option is B 15m above the ground h=20t−12×10×t2 40−h=20t+12×10t2 ⇒40−20t+5t2=20t+5t2 ⇒t=1s ⇒h=20×1−5(1)2=20−5=15m Therefore 15m above from the ground

Suggest Corrections
2
Join BYJU'S Learning Program
Select...
Related Videos
Basic Operations
PHYSICS
Watch in App
Explore more
Join BYJU'S Learning Program
Select...