A pellet of mass 8.8 g embeds itself in a wooden block of 450 g which is suspended by a light in-extensible string. After the collision the block reaches a max height of 0.63 m. Calculate the initial velocity of the pellet.

Max Gravitational Potential energy of combined mass:GPE = m x g x h= ( 0.0088 kg + 0.450 kg ) x 9.81 ms^-2 x 0.63 m = 2.84 J
Therefore Kinetic energy of the combined mass at the collision = 2.84 JKE = 1/2 x m x V^2V^2 = 2 x 2.84J / (0.0088 kg + 0.450 kg) = 12.38V = (12.38)^0.5 = 3.52 m/s
The momentum of the combined mass:p = m x V= 0.4588 kg x 3.52 m/s = 1.61 kg m/s
Therefore the initial momentum of the pellet = 1.61 kg m/sV = p / mV = 1.61 kg m/s / 0.0088 kg = 182.95

TL
Answered by Thomas L. Physics tutor

5228 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

A projectile is fired out of a cannon at 50 km/s, at an angle of 30 degrees and an elevation of 10m from the ground. How long does it take for the projectile to hit the ground?


A 10m long uniform beam is pivoted in its centre. A 30kg point mass is placed on one end of the beam. Where must a 50kg mass be placed in order to balance the beam?


Ignoring air resistance, use an energy argument to find the speed of a ball when it hits the ground if it is dropped from 50m, where m is the mass of the ball.


One of the decays of potassium (A=40, Z=19) results in an excited argon atom with excess energy of 1.50 Mev. In order to be stable, it emits a gamma photon. What frequency and wavelength has this gamma photon?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences