Mechanics | Relativity Answers

A player is about to drive into the rim but at a distance of 10ft a defender came his way. So he decided to take a fade away jump shot having a jumping velocity of 11ft/s at 50degrees to the horizontal. He will be releasing the ball at the highest point of his jump; he also leaned back at an angle of 40degrees to the vertical to further himself from the defender. If the player's shooting height is 6ft and takes his shot at 40degrees to the horizontal, how much initial velocity must he exert unto the ball if the hoop is 10ft high from the floor?

A person travels along straight road for first t/3 time with speed V1 and for next 2t/3 time with speed V2. Then average velocity(V) of person was
(1) V = V1+2V2/3
(2) 1/v = 1/3V1+2/3V2
(3) V = 1/3* square root (2V1V2)
(4) V = square root (3V2/2V1)

A ball is dropped from bridge of 122.5 m above river. After the ball has been falling for 2 seconds ,a second ball is thrown straight down after it. Initial velocity of second ball ao that both hit the water at same time.
(1) 49m/sec
(2) 55.5m/sec
(3) 26.1m/sec
(4)9.8m/sec

A body is thrown vertically upwards and takes 5 seconds to reach maximum height. The distance travelled by the body will be same in
(1) 1st &10 th sec
(2) 2nd & 8 th sec
(3) 4th & 6th sec
(4) Both (2) &(3)

A uniform ladder weighing 330 Newton is leaning against a wall. The ladder slips when the angle with the floor is 50 degrees. Assuming the coefficient of the static friction at the wall and the floor are the same, obtain a value for static friction.

Sally travels by car from one city to another. She drives for 29.0 min at 79.0 km/h, 31.0 min at 33.0 km/h, and 15.0 min at 26.0 km/h, and she spends 6.0 min eating lunch and buying gas. Determine the average speed for the trip.

An object with a mass of 4 kg is kept motionless on an inclined plane by a force parallel to the plane. The angle of the incline is 30°; the object is at a vertical height of 10 m above the bottom; friction is negligible. What is the value of the force in Newtons?
A) 4.0
B) 4.9
C) 9.8
D) 19.6
E) 39.2

An elevator weighing 2.5 10^4N is raised to a height of 10 meters. Neglecting friction, the work done is
A) 2.5 10^4 J
B) 2.5 10^5 J
C) 2.5 10^3 J
D) 7.5 10^4 J
E) 98 J

A car is traveling on a level highway at a speed of 15m/s. A braking force of 3000 N brings the car to a stop in 10 seconds. The mass of the car is?
A) 1500kg
B) 2000kg
C) 2500kg
D) 3000kg
E) 45,000kg

The period of a simple pendulum in a laboratory does not depend on
A) the altitude of the laboratory
B) the acceleration due to gravity in the laboratory
C) the length of the string
D) the vibration in the laboratory
E) the mass of the bob