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a. with zero speed at an instant may have non-zero acceleration at that instantAns: The above statement is true. When an object is thrown vertically up in the air, its speed becomes zero at maximum height. It has acce...
a. What is the direction of acceleration during the upward motion of the ball?Ans: Acceleration of the ball (which is actually acceleration due to gravity) always acts in the downward direction towards the centre of t...
In the above question it is given that:Distance covered with 1 step = 1 min Time taken = 1 sTime taken to move first 5 m forward = 5 sTime taken to move 3 m backward =3 sNet distance covered = 5 3 = 2mNet time taken to c...
: In the above question it is given that:Speed of the woman = 5 km/hrDistance between her office and home = 2.5 kmTime Taken = distance / speed= 2.5/5 = 0.5 h = 30 min It is given that she covers the same distance in th...
(a) A railway carriage moving without jerks between two stations.Ans: As the size of a carriage is very small as compared to the distance between two stations, the carriage can be treated as a point sized object. (b)...
· 1st Law: Object remains at rest or uniform motion unless a force acts. (e.g., passenger jerks forward in braking car)· 2nd Law: F=ma - Acceleration is proportional to force. (e.g., heavier carts n...
Let object start with velocity u and constant acceleration a Using area under v–t graph:1. v=u+at2. s=ut+1/2at^2 3. v^2=u^2+2as All derived using geometric interpretation of motion.
Theorem: Work done = Change in kinetic energy W=ΔKE=1/2mv^2−1/2mu^2 Conservative Forces: Path-independent (e.g., gravity) Non-Conservative Forces: Path-dependent (e.g., friction)
Significant figures are digits in a number that contribute to its precision. Rules:· All non-zero digits are significant.· Zeros between non-zero digits are significant.· Leading zeros are no...
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