wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A ball of mass 10kg is moving with a velocity of 10m/s. It strikes another ball of mass 5kg, which is moving in the same direction with a velocity of 4m/s. If the collision is elastic their velocities after the collision will be respectively.

A
8m/s,10m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
6m/s,10m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
6m/s,12m/s
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
8m/s,12m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 6m/s,12m/s
Mass of first ball is m1=10 kg and its velocity before collision u1=10 m/s
Mass of second ball is m2=5 kg and its velocity before collision u2=4 m/s
Velocity of first ball after collision v1=(m1em2)u1+(1+e)m2u2m1+m2
where e=1 (elastic collision)
v1=(101×5)(10)+(1+1)(5)(4)10+5=6 m/s
Velocity of second ball after collision v2=(m2em1)u2+(1+e)m1u1m1+m2
v2=(51×10)(4)+(1+1)(10)(10)10+5=12 m/s

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Realistic Collisions
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon