A65 On a lincar air-track the gliders float on a cushion of air and move with negligible friction. One such glider of mass 0.50 kg is at rest on a level track. A student fires an air rifle pellet of mass i.5 x 10 'kg at the glider along the line of the track. The pellet embeds itself in the glider which recoils with a velocity of, 0.33 ms. (a) State the principle you will ese to calculate the velocity at which the pellet struck the glider. Calculate the velocity at which the pellet struck. (b) Another student repeats the experiment with the air-track inclined at an angle of 2 to the horizontal. Initially, the glider is at rest at the bottom of the track. After the impact the glider recoils with the same initial velocity but slows down and stops momentarily further along the track. Explain in words how to calculate how far along the air track the glider moves before stopping instantaneously.

A65 On a lincar air-track the gliders float on a cushion of air and move with negligible friction. One such glider of mass 0.50 kg is at rest on a level track. A student fires an air rifle pellet of mass i.5 x 10 'kg at the glider along the line of the track. The pellet embeds itself in the glider which recoils with a velocity of, 0.33 ms. (a) State the principle you will ese to calculate the velocity at which the pellet struck the glider. Calculate the velocity at which the pellet struck. (b) Another student repeats the experiment with the air-track inclined at an angle of 2 to the horizontal. Initially, the glider is at rest at the bottom of the track. After the impact the glider recoils with the same initial velocity but slows down and stops momentarily further along the track. Explain in words how to calculate how far along the air track the glider moves before stopping instantaneously.