Mechanics | Relativity Answers

1. Ahmad is driving North on Highway 69 at 90 km/h and sees a large moose on the road. He quickly slams on his brakes, but his reaction time is 0.85 s (as he sees the moose, thinks about his response, and then presses the brake pedal). He presses the brake for 3.5 s and comes to a stop just in time.
a) Find the distance travelled after seeing the moose and before pressing the brake.
b) Find the total distance he travelled before coming to a stop.
c) Find the average acceleration once he presses the brake.

car passes point A with a velocity of 10m/s.it has a steady acceleration of 4m/s.what is its velocity when it passes point B.the time between point A and point B is 6 seconds

Jane swims the length of a 40 meter pool in 10 seconds and immediately swims back to the starting position in another 15 seconds. What was her average velocity?

In a stamping machine the die has a mass of 30 kg and falls freely a distance of 2 m to strike a metal block. The depth of indentation is 10mm. Assuming that the die does not rebound Determine the average resistance of the metal. You are required to compare and contrast by solving this problem in two ways:
a) by making use of the principle of conservation of momentum and D’Alembert’s principle
b) by making use of the principle of conservation of energy.

A cannon fires a cannonball with a muzzle velocity of 50 m/sec at an angle of 40°.
What Is the fligjt Time?
What Is the cannonball maximum altitude?
What Is the cannon's range at tjis angle?

An athlete accelerates to 10 m/sex and then jumps at a 25° angle. How far Will he jumps?

A ball is thrown with a velocity of 10 m/sec at 35°. How far Will the ball travel horizontally?

A bullet is fired at a 10° angle from a rifle having a muzzle velocity of 150m/sec.
How many seconds is the bullet un the air?
How far does the bullet travel horizontally before striking the ground?
How far does the bullet Rose before beginning to fall?

The launching speed of certain projectile is 5 times it has at its maximum height .Its angle of projection is

A car weighing 9800 N is moving with a speed of 50 km./h.On the application of the brakes it comes to rest after travelling a distance of 60m .Calculate the average retarding force.