A 9 kg asteroid is traveling through space at 2.5 m/s toward a spaceship. To avoid a collision, an astronaut, with the help of a backpack rocket, exerts a force of 25N on the asteroid in the opposite direction for 4 seconds. a) Find the asteroid s final speed. m/s (Hint: Assume the initial speed f the asteroid is in the positive x direction.) b) How long should she have pushed in order to just stop the asteroid? Time to stop asteroid = seconds

Sam, whose mass is 74.0 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 220.0 N and a coefficient of kinetic friction wtih the snow of 0.07. Unfortunately, the skis run out of fuel after only 11.5 seconds. What Sam's top speed (in m/s) assuming that the acceleration due to gravity is 9.80 m/s2? How far (in m) has Sam traveled when he finally coasts to a stop?

An antitank weapon fires a 3.00-kg projectile which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the projectile was accelerated uniformly, what was the average force that acted on it? a. 4.17×(10^3)N b. 3.62×(10^3)N C. 2.82×(10^3)N d. 2.00×(10^3)N

Sam, whose mass is 73 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 240 N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 15 s. ▼ Part A What is Sam's top speed? Express your answer with the appropriate units. V = Submit Part B Value S = μÀ Request Answer Submit How far has Sam traveled when he finally coasts to a stop? Express your answer with the appropriate units. HÅ Value Request Answer m/s < Return to Assignment www m ? = ? Provide Feedback

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Question 10 A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s. You may want to review (Pages 234 - 241). ▼ Part A Assuming that air resistance can be ignored, find the initial speed of the rock. Express your answer using two significant figures. ? vo = m/s Submit Request Answer Part B Find the greatest height of the rock as measured from the base of the cliff. Express your answer using two significant figures. ? Hmax =

A cat kicks a 0.43 kg chees block that was initially at rest. the net force is 20. What is the cheeses speed at t= 20 ms

A0.28-kg rock is thrown vertically upward from the top of a cliff that is 31 m high. When it hits the ground at the base of the cliff, the rock has a speed of 30 m/s . You may want to review (Pages 234 -241) - Part A Assuming that air resistance can be ignored, find the initial speed of the rock. Express your answer using two significant figures. ? m/s Submit Requeet Answer Part B Find the greatest height of the rock as measured from the base of the cliff. Express your answer using two significant figures. Hmar = Submit Requeet Anewer

NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. The subway train shown is traveling at a speed of 38 mi/h when the brakes are fully applied on the wheels of car A, causing it to slide on the track, but the brakes are not applied on the wheels of cars B or C. 40 tons B The force FAB is 19.388 The force FBC is 50 tons ‒‒‒‒‒ C Knowing that the coefficient of kinetic friction is 0.35 between the wheels and the track, determine the force in each coupling. 40 tons lb Compression 8.6 lb Compression

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