a frictionless plane is 10.0 m long and inclined at 31.0 degree a sled starts at the bottom with an initial speed of 5.40 m/s up to incline. when the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline with an initial speed v1. both sleds reach the bottom of the cline at the same time. A. determine the distance that the first sled traveled up the incline. ___________ m Determine the initial speed of the second sled _________ m/s

A test car is driving toward a solid crash-test barrier with a speed of 45 mi/h. Two seconds prior to impact, the car begins to brake, but it is still moving when it hits the wall. After the collision with the wall, the car crumples somewhat and comes to a complete stop. In order to estimate the average force exerted by the wall on the car, what information would you need to collect?  a. The (negative) acceleration of the car before it hits the wall and the distance the car travels while braking.  b. The (negative) acceleration of the car before it hits the wall and the velocity of the car just before impact.  c. The velocity of the car just before impact and the duration of the collision with the wall.  d. The duration of the collision with the wall and the distance the car travels while braking.

A physics student with mass 51kg slides in the snow (see figure). Find the velocity for each points @ A, B, C, D and E. D 100 m 60 m 30 m B.

Priya throws a 2-kg rock from a height of 26 m, straight up at 15 m/s. a. How fast will the rock be traveling 3.0 s later? b. What is the maximum height above the ground the rock will reach? c. How fast will the rock be travelling when it hits the ground? d. What would be the maximum height of a 4-kg rock, if thrown in the same manner.

A contestant in a Winter games event pushes a 31.0 KG black of ice across a frozen Lake the coefficient of static friction is 0.1 in the coefficient of kinetic friction 0.3 calculate the minimum force he must exert to get the black moving? N What is the acceleration once it starts to move if that force is maintained? M/S2

A 70-kg man stands on a bathroom scale inside an elevator. The scale measures in units of newtons. a. The elevator accelerates upward from rest at a rate of 1.20 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval? b. The elevator continues upward at constant velocity for 8.50 s. What does the scale read now? c. While still moving upward, the elevator's speed decreases at a rate of 0.600 m/s2 for 3.00 s. What is the scale reading during this time?

A box is being pulled to the right over a rough surface. T> fk, so the box is speeding up. Suddenly the rope breaks. What happens? The box Select one: a. Slows steadily until it stops b. Continues with the speed it had when the rope broke С. Continues speeding up for a short while, then slows and stops. O d. Keeps its speed for a short while, then slows and stops. e. Stops immediately

A cyclist is travelling at 21 km/h when she sees a stop sign ahead.  She applies the brakes and comes to a stop in 15 m.  The mass of the cyclist and the bike is 73 kg. a. Calculate the acceleration of the cyclist. b. Determine the coefficient of friction between the road and the bike tires.

Two identical boxes with mass m are placed on inclined surfaces with coefficient of kinetic friction and connected by a light rope passing through a frictionless pulley as shown in the figure. Which of the following gives the correct expression for the system's accelera- tion? A. a = (sin 3-sina) - B. a (sin 3-sina) - C. a = (sin a-sin 3) - D. a (sin a sin 3) - (cosa = - = (cosa + cos 3) (cosa - cos (3) (cosa + cos 3) cos 3) α |6|× m B

A block is launched up an inclined plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3. The speed of the block when it reaches the starting position on the trip down: A.) is the same as the launching speed. B.) cannot be compared to the launch speed with the information given. c.) is greater than the launching speed. D.) is less than the launching speed.