1. A stone is thrown horizontally at a speed of 5 m/s from the top of a cliff 78.4 meters high.
a. how long does it take to reach the bottom of the cliff?
b. how far from the base of the cliff does the stone strike the ground?
c. what are the horizontal and vertical components of the velocity of the stone just before it hits the ground?
2. A player kicks a football from ground level with a velocity of 27 m/s at an angle of 30 degree above the horizontal. Find...
a. its "hang time", that is the time the ball is in the air
b. the horizontal distance the ball travels before it hits the ground
c. its maximum height
3. When a shot-putter exerts a net force of 140N on a shot, the shot has an acceleration of 19m/s(squared). What is the mass of the shot?
4. A car of mass of 1225kg is traveling at 105km/h, slows to a stop in 53m. What is the size and the direction of the force that acted on the car? What provided the force?
5. Imagine a spider with a mass 0.00007kg moving downward on its thread. The thread exerts a force that results in a net upward force on a spider of 0.00012N.
a. What is the acceleration of the spider?
b. Explain the sign of the velocity of the spider and describe in words how the thread changes the velocity of the spider.
pls...... answer...thanks
a. how long does it take to reach the bottom of the cliff?
b. how far from the base of the cliff does the stone strike the ground?
c. what are the horizontal and vertical components of the velocity of the stone just before it hits the ground?
2. A player kicks a football from ground level with a velocity of 27 m/s at an angle of 30 degree above the horizontal. Find...
a. its "hang time", that is the time the ball is in the air
b. the horizontal distance the ball travels before it hits the ground
c. its maximum height
3. When a shot-putter exerts a net force of 140N on a shot, the shot has an acceleration of 19m/s(squared). What is the mass of the shot?
4. A car of mass of 1225kg is traveling at 105km/h, slows to a stop in 53m. What is the size and the direction of the force that acted on the car? What provided the force?
5. Imagine a spider with a mass 0.00007kg moving downward on its thread. The thread exerts a force that results in a net upward force on a spider of 0.00012N.
a. What is the acceleration of the spider?
b. Explain the sign of the velocity of the spider and describe in words how the thread changes the velocity of the spider.
pls...... answer...thanks