Crate A ( m A = 150 kg) containing a smaller, heavier crate B ( m B = 300 kg) is
ID: 2252993 • Letter: C
Question
Crate A (mA = 150 kg) containing a smaller, heavier crate B (mB = 300 kg) is being air-dropped by parachute, as shown.
Crate A has an accurate scale built into its floor. When that crate floor is 40.2 m above the level ground, the scale reads 1680 N, and it is moving vertically downward at a speed of 9.70 m/s.
When it reaches the ground, the crate lands on a platform mounted on a spring (k = 3.96 x 103 N/m) that is embedded in the earth, as shown.
Before the impact, the platform
Crate A (mA = 150 kg) containing a smaller, heavier crate B (mB = 300 kg) is being air-dropped by parachute, as shown. Crate A has an accurate scale built into its floor. When that crate floor is 40.2 m above the level ground, the scale reads 1680 N, and it is moving vertically downward at a speed of 9.70 m/s. When it reaches the ground, the crate lands on a platform mounted on a spring (k = 3.96 times 103 N/m) that is embedded in the earth, as shown. Before the impact, the platform's top surface is level with the ground. After impact... when the platform's top surface is 4.50 m below ground level, what is the speed of the crates? when the platform's top surface is 4.50 m below ground level, what is the reading on crate A's scale? You may neglect the mass of the platform, spring, parachute and ropes, and you may assume that the tension from the parachute disappears when the crate hits the platform.Explanation / Answer
Crate A ( m A = 150 kg) containing a smaller, heavier crate B ( m B = 300 kg) is