A body of mass 5 kg is moving with a velocity of 10 m/s. Now a force that delivers a constant power of 75 watts is applied to it for 10 s in the same direction. The velocity of the body after 10 s will be

1.  $10\sqrt{2} \mathrm{m}/\mathrm{s}$

2.  20 m/s

3.  40 m/s

4.  $25\sqrt{2}$m/s

A mass of 4kg falls from a height h on the pan. Initially, the spring is in its natural length and mass of spring and pan are negligible. Spring constant of the spring is 1000 N/m. The mass compresses the spring by 0.5 m. Then the height 'h' is

1.  2.00 m

2.  1.56 m

3.  4.0 m

4.  2.625 m

Human heartbeats 72 times per minute. It pumps 1 cc blood in each pulse under the pressure of $2 \times {10}^{{}^4 } \mathrm{N}/{\mathrm{m}}^2.$ The power of the heart is 

1.  0.2 watt

2.  0.02 watt 

3.  0.024 watt

4.  $2.2 \times {10}^{-1}$watt

A body having an initial kinetic energy 2 J collides with an identical body at rest. The maximum loss of kinetic energy in the collision will be:

A particle is thrown at an acute angle with the horizontal. Select the incorrect statement.

What is the work done by friction when the body slides down the inclined surface from A to B? 

(1) 32 J

(2) 16 J

(3) 8 J

(4) Zero

Block A moves on the smooth surface and collides with the block B at rest. The maximum energy stored in the spring will be

1.  $\frac{1}{8}{\mathrm{mv}}^2$

2.  $\frac{1}{4}{\mathrm{mv}}^2$

3.  $\frac{1}{3}{\mathrm{mv}}^2$

4.  $\frac{1}{2}{\mathrm{mv}}^2$

An object of mass 2 kg falls from rest through a vertical distance 10 m and acquires a velocity of 10 m/s. The work done by the resistive force of air on the object is (g = 10 $\mathrm{m}/{\mathrm{s}}^2$)

(1)  200 J

(2)  -200 J

(3)  150 J

(4)  -100J

A body of \(10\) kg is subjected to a force as shown in the figure. The block moves along a straight line under the influence of this force. The change in kinetic energy when the body moves from \(x=0\) to \(x=4\) m will be:

1. \(15\) J
2. \(12.5\) J
3. \(17.5\) J
4. \(19.2\) J

A constant horizontal force is applied on a block kept at rest on a smooth horizontal surface. Its power \((P)\) versus time \((t)\) graph is best shown by:

1.		2.
3.		4.