A hammer weighing 1 kg moving with the speed of 20 m / s strikes the head of a nail driving it 20 cm into a wall. Neglecting the mass of the nail, calculate
(i) the acceleration during the impact
(ii) the time interval during the impact
(iii) the impulse.

5

(a)

Give the magnitude and direction of the net force acting on a cork of mass 10 g floating on water.

5

(a)

Give the magnitude and direction of the net force acting on a kite skillfully  held stationary in the sky.

5

(a)

A stone of mass 0.20 kg is tied to one end of a string of length 80 cm, holding the other end, the stone is whirled into a vertical circle. What is the minimum speed of the stone at the lowest point so that it just completes the circle. What is the tension in string at lowest point of the circular path ? ( g = 10 m / s²)

5

(a)

A truck starts from rest and accelerates uniformly at 2.0 m s^-2. At t = 10 s, a stone is dropped by a person standing on the top of the truck (6 m high from the ground). What are the (a) velocity, and (b) acceleration of the stone at t = 11s ? (Neglect air resistance.)

5

(a)

A disc revolves with a speed of 33\(1\over3\) rpm and has a radius of 15 cm. Two coins are placed at 4 cm and 14 cm away from the centre of the record. If the coefficient of friction between the coins and record is 0.15, which of the coins will revolve with the record?

5

(a)

State Newton's second law of motion. How does it help to measure force? Also state the units of force.

5

(a)

State Newton's third law of motion. Discuss its consequences

5

(a)