A steel ball falls from a height h on a floor for which the coefficient of restitution is e. The height attained by the ball after two rebounds is
A
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is D The velocity attained after a fall through a height h is given by v2=2gh Thus h∝v2 The velocity after first rebound is ev. Therefore, the height attained after first rebound = e2h. Velocity after second rebound is e2v. Hence the height attained after second rebounds is e4h. Thus the correct choice is (d).