Last seen: Nov 14, 2021
(i) Distance travelled = 6 km (ii) Displacement = zero(since final position is same as initial position)
Distance travelled in half a rotation of a circular path is equal to the circumference of semi-circle, i.e., = πR. Displacement = Diameter of circle...
(a) Average speed vav = = = 30 m/s (b) Time = 1s Distance = Vav x time = 30 x 1 = 30 m/s (c) Time = 6s Distance = Vav x time = 30 x 6 = 18...
(i) In the first part, train travels at a speed of 30 km/h for a distance of 15 km. Speed = Time = t1 = = h (ii) In the second part, train ...
Total distance = 200 km Average speed = 70 km/h Total time taken = = = h For first part of the journey, Distance = 100 km Speed = 50 km/...
(a) Acceleration of a body is defined as the rate of change of its velocity with time. SI unit of acceleration is m/s2. (b) A body has uniform acce...
(a) Velocity is defined as the distance travelled by the body in unit time in a given direction. The SI unit of velocity is m/s. (b)(i) Speed is a s...
(a) Speed is defined as the distance travelled by a body per unit time. Its SI unit is m/s. (b) (i) Average speed is the sum total of the distance t...
A body is said to be in motion when its position changes continuously with respect to a stationary object taken as reference point. A body has unif...
(a) Distance travelled is the actual length of the indirect path covered by the body whereas displacement refers to the straight line path between the...
Deceleration, a = -5m/s2 Initial velocity, u = 20 m/s Final velocity, v = 0 m/s t = ? a = -5 = t = = 4s
Initial velocity, u = 600 km/h Final velocity, v = 1100 km/h Acceleration = 10 km/h/s = 600 km/h2 From relation, a = t = t = = = hr...
Initial velocity = 0 m/s Final velocity = 6 m/s Time = 3 sec Acceleration = = = = 2 m/sec2
Speed from A to B = 30 km/h Let the distance from A to B be D. Time taken to travel from A to B, T1 = T1 = Speed from B to A = 20 km/h Tim...
Total distance travelled = 100 m Total time taken = 9.83 sec Average speed = = = 10.172m/s Average speed in km/h = 10.172 x () = 36.62 km...
Total distance = 100m = 0.1 km Total time taken = 15 minutes = = 0.25 hour Average speed = = = 0.4km/h
Correct answer: (1) Random drift
Correct answer: (2) dogfish and whale
Correct answer: (4) Mesozoic era
Correct answer: (4) Gause's hypothesis