Two blocks A and B have masses `m` and `4m`, respectively. Each one is acted upon by a force `F`. If they acquire the same kinetic energy in time `t_A` and `t_B`, then `(t_A)//(t_B)` is

Two bodies A and B have masses 20 kg and 5 kg respectively. Each one is acted upon by a force of 4 kg wt. If they acquire the same kinetic energy in times t_A and t_B , then the ratio t_A/t_B is

Two bodies A and B have masses 20 kg and 5 kg respectively. Each one is acted upon by a force of 4 kg wt. If they acquire the same kinetic energy in times t_A and t_B , then the ratio t_A/t_B is

A block of mass m at rest is acted upon by a force F for a time t. The kinetic energy of block after time t is

A block of mass m at rest is acted upon by a force F for a time t. The kinetic energy of block after time t is