Percentage of total distance covered in 5th Second by a freely falling body is

A bullet emerges from a barrel of length 1.2 m with a speed of $640\,\,m{s^{ - 1}}$. Assuming constant acceleration the approximate time that its spends in the barrel after the gun is fired is

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is ${S_1}$ and that covered in the first 20 seconds is ${S_2}$ , then

An object moving with a velocity of 20 m/s comes to rest in 4 seconds. What is its acceleration?

The x and y coordinates of a particles at any time t are given by $x = 7t + 4{t^2}\,\,and\,\,y = 5t,$, where x and y are in metre and t in second. The acceleration of particle at t=5s is

A ball from height $h$ . After 1 second another ball falls freely from a point 20 m below the point from where the first ball falls. Both of them reach the ground at the same time what is the value of $h$ .

If ${S_n} = 2 + 0.4n$, find initial velocity and acceleration $\left[ {{\rm{in}}\,\,{\rm{units}}} \right]$

A car is travelling at $72{\rm{\;km}}{{\rm{h}}^{ - 1}}$ and is 20 m from a barrier when the driver puts on the brakes. The car hits the barrier 2s later. What is the magnitude of the constant deceleration?

A bus begins to move with an acceleration of $1\,m{s^{ - 2}}$ . A man who is 48 m behind the bus starts running at $10\,m{s^{ - 1}}$ catch the bus. The man will be able to catch the bus after

The effective acceleration of a body, when thrown upwards with acceleration a will be

The driver of a car moving with a speed of $10{\rm{m}}{{\rm{s}}^{ - 1}}$ sees a red light ahead, applies breaks and stops after covering 10m distance. If the same car were moving with a speed of $20{\rm{m}}{{\rm{s}}^{ - 1}}$, the same driver would have stopped the car after covering 30 m distance. Within what distance the car can be stopped if travelling with a velocity of $15{\rm{m}}{{\rm{s}}^{ - 1}}$? Assume the same reaction time and the same deceleration in each case.