Laws of Motion · Question 65

On the horizontal surface of a truck a block of mass 1 kg is placed ( = 0.6) and the truck is moving with acceleration 5 m/s2, then the frictional force on the block will be

1. 5 N
2. 6 N
3. 5.88 N
4. 8 N

A cricketer catches a ball of mass 150 g in 0.1 s moving with speed 20 m/s, then he experiences a force of

1. 300 N
2. 30 N
3. 3 N
4. 0.3 N

A 1 kg stationary bomb is exploded in three parts having mass 1 : 1 : 3 respectively. The parts having the same mass move in perpendicular directions with velocity 30 m/s, then the velocity of the bigger part will be

1. 10 2 m/s
2. 10 2 m/s
3. 15 2 m/s
4. 15 2 m/s

A body of mass 3 kg hits a wall at an angle of 60 and returns at the same angle. The impact time was 0.2 s. The force exerted on the wall is [figure]

1. 150 3 N
2. 50 3 N
3. 100 N
4. 75 3 N

Two masses as shown in the figure are suspended from a massless pulley. The acceleration of the system when masses are left free is [figure]

1. 2g3
2. g3
3. g9
4. g7

A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s. The velocity of other part is (Take g = 10 m s-2)

1. 40 m/s
2. 50 m/s
3. 100 m/s
4. 60 m/s