1800-150-456-789
FlagBACK
Flag Mechanics> A bullet travelling with a velocity of 16...
question mark

A bullet travelling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4 m. Find the time taken during the retardation.

Radhika Batra , 10 Years ago
Grade 11
anser 3 Answers
Kevin Nash

Last Activity: 10 Years ago

Sol. u = 16 m/s (initial), v = 0, s = 0.4 m. Deceleration a = (v^2-u^2)/2s = -320 m/s2. Time = t = (V -u)/a = (0-16)/(-320 ) = 0.05 sec.

Sai Sriker Reddy Kuskuntla

Last Activity: 7 Years ago

u=16 m/s v=0S=0.4A=(v*v)-(u*u)/2A=0-256/0.8=-320t =(v-u)/a= -16/-320=0.05 secondTime taken during its motion in trunk=0.05 secondRetradation =320 m/s

Sakshi Kumari

Last Activity: 6 Years ago

Initial velocity= u= 16 m/s
distance covered = S=  0.4 m
Final velocity=v= 0 m/s 
the equation of motion;
v²=u²+2aS
0=16²+2 x a x 0.4 
a=-16²/0.8  
a=-320 m/s
As it carries a negative sign it represent retardation. 
Time taken during the retardation is given by the equation;
 v=u+at 0= 16-320 x t   
t=16/320 
t=1/20 
t=0.05 s
 

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on mechanics

question mark
A metal strip clamped at one end vibrates with a frequency of 20 Hz and amplitude of 5 mm
at the free end, where a small mass of 2 g is positioned. determine
(i) The velocity of the end when passing through the zero position
(ii) The acceleration at maximum displacement
(iii) The maximum kinetic energy of the mass
mechanics
2 Answers Available

Last Activity: 2 Years ago

question mark
An object of mass m = 0.25 kg oscillates in a fluid at the end of a vertical spring of spring
constant kH = 85 N/m, see Fig.1. The effect of the fluid resistance is governed by the
damping constant b = 0.07kg/s.
(i) Find the period of the damped oscillation.
(ii) By what percentage does the amplitude of the oscillation decrease in each cycle? 
mechanics
1 Answer Available

Last Activity: 2 Years ago

question mark
If a=x² find the displacement at t =3sec if body velocity at t= 0 sec is 0
mechanics
1 Answer Available

Last Activity: 2 Years ago

question mark
A particle is traveling in a circle of radius R =2.5m and with an angular velocity of 10 rad/s. What is the centripetal acceleration of the particle? The particle begins to slow down with an angular acceleration of -1 rad/s2. After 5 seconds, what is the centripetal acceleration and the tangential acceleration fo the particle?
mechanics
1 Answer Available

Last Activity: 2 Years ago

question mark
If the acceleration of block A is 5 m/s^2
Find the acceleration of block B
mechanics
1 Answer Available

Last Activity: 2 Years ago