A force of 25.0 N is applied in the positive x-direction to a block of mass 8.65 kg, at rest on a frictionless surface.   (a) What is the block's acceleration (in m/s2)? (Indicate the direction with the sign of your answer.)   (b) How fast is it going (in m/s) after 5.50 s?

A person with a mass of 72.kg sprints with an acceleration of 6.3 m/s^2. What is the magnitude of force?

A car has a mass of 1.30 × 103 kg. If the force acting on the car is 6.49 × 103 N to the east, what is the car’s acceleration? Answer in units of m/s 2 .

A spaceship lifts off vertically from the Moon, where g = 1.6 m/s2. If the ship has an upward acceleration of 1.0 m/s2 as it lifts off, what is the magnitude of the force exerted by the ship on its pilot, who weighs 735 N on Earth?

On the moon, the acceleration due to gravity is equal to 1.67 m/s^2.  How much does an astronaut weigh there, whose mass combined with his spacesuit is 171 kilograms.?  Express your answer in units of Newtons.

A person of mass m = 55 kg is in an elevator which is accelerating upward at acceleration a= 2.3 m/s. What is the apparent weight in Newtons, of the person in the elevator during this ride? (Hint: the apparent weight is same as the normal force experienced by the person)

Two weights, each weighing m, are hung over a pulley. If an additional weight of 100 g is attached to one of the weights, it is lowered by 564 cm in the first 2.00 s. What is the mass m? What was the force of the rope before adding the new weight? What is the force of the rope after adding the new weight? (The solutions are 124 g, 1.22 N, 1.57 N)

A falling ball of mass 0.5 kg experiences a downward force due to gravity of mg (where g = 9.8 m/s2) and an upward force of air resistance equal to 3.5 N. What is the ball’s acceleration in units of m/s2?

The coefficient of static friction between block A and a horizontal floor is 0.470, and the coefficient of static friction between block B and the floor is 0.300. The mass of each block is 2.00 kg, and they are connected together by a cord. If the horizonta force F pulling on block B slowly increased, in a direction parallel to the connecting cord, until the blocks start sliding, what is the magnitude of F at the instant that they start to slide?

An object with a mass of 7.5 kg accelerates 8.3 m/s? when an unknown force .» applied to it. What is the amount of the force?