Questions in Laws of Motion

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In the above problem if the lift moves up with an acceleration equal to the acceleration due to gravity, the reading on the spring balance will be
A coin is dropped in a lift. It takes time ${t_1}$ to reach the floor when lift is stationary. It takes time ${t_2}$ when lift is moving up with constant acceleration. Then
If the tension in the cable of 1000 kg elevator is 1000 kg weight, the elevator
A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m / s, then after 4 sec his displacement relative to the ground will be
In doubling the mass and acceleration of the mass, the force acting on the mass with respect to the previous value
A force of 5 N acts on a body of weight 9.8 N. What is the acceleration produced in $m/{\sec ^2}$
A body of mass 40 gm is moving with a constant velocity of 2 cm/sec on a horizontal frictionless table. The force on the table is
When 1 N force acts on 1 kg body that is able to move freely, the body receives
An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is
An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction, the force acting on the object is

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