A stone projected vertically upward moves according to the law s=100t-16t2. The acceleration at t= 2 sec is

1.  -32unit/sec2

2.  32unit/sec2

3.  16unit/sec2

4.   8unit/sec2

View Answer  
4
Correct Answer :

-32unit/sec2


Explanation :
No Explanation available for this question

A particle moves along a line according to the law s=t4-5t2+8. The initial velocity is

1.  1

2.   5

3.  4

4.  0

View Answer  
4
Correct Answer :

0


Explanation :
No Explanation available for this question

A particle moves along a line according to the law s=4t3-3t2+2. At what time will the acceleration be equal to 42 unit/sec2..

1.  1sec

2.   2sec

3.  4sec

4.  8sec

View Answer  
4
Correct Answer :

2sec


Explanation :
No Explanation available for this question

The distance from a fixed point O of a particle P moving in a straight line from O is given by s=16+48t-t3. The direction of motion of the particle after t=4 sec is

1.  Towards O

2.  Away from O

3.  Rest

4.  None

View Answer  
4
Correct Answer :

Towards O


Explanation :
No Explanation available for this question

The distances covered in time t by a particular moving along a straight line from O is given by s=√1+t. its acceleration is proportional to the … of its velocity  at the instant

1.  Square

2.  Cube

3.  Double

4.  None

View Answer  
4
Correct Answer :

Cube


Explanation :
No Explanation available for this question

The velocity v and the distance s travelled by a particle has the relation 2+3v2=s2. Then acceleration is

1.  s

2.  s/2

3.  s/3

4.  v

View Answer  
4
Correct Answer :

s/3


Explanation :
No Explanation available for this question

The velocity v of a point moving a long a line when it is at a distance x from the origin is given by a+bv2=x2. Acceleration of the point at t is

1.   x

2.  x/b

3.  x/bv

4.  none

View Answer  
4
Correct Answer :

x/b


Explanation :
No Explanation available for this question

The distance travelled by a particle in time t is given by s=10t-7t3. The maximum velocity is

1.  10unit/sec

2.  0

3.  8/3unit/sec

4.  -3unit/sec

View Answer  
4
Correct Answer :

10unit/sec


Explanation :
No Explanation available for this question

A particle is moving along a straight line according to the law s=16+48+t-t3. Then distance travelled by the particle before coming to rest at an instant is

1.  100unit

2.   120unit

3.   144unit

4.  136unit

View Answer  
4
Correct Answer :

144unit


Explanation :
No Explanation available for this question

A particle moving according to the law s=6t-1/2t3. At what time its velocity vanishes

1.  1 sec

2.  2sec

3.   4sec

4.   8 sec

View Answer  
4
Correct Answer :

2sec


Explanation :
No Explanation available for this question
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