Force acts for 20 s on a body of mass 20 kg , starting from rest, after which the force ceases and then body describes 50 m in the next 10 s . The value of force will be :

Step-by-step solution

For the second case when body is moving with constant velocity, we can write 50   =   V   ×   10 ⇒ V = 5   m   s - 1 Now this velocity if the final velocity for the first case, therefore V   =   0 + a × 20 ⇒ 5 = a × 20 ⇒ a = 1 4 m   s - 2 Hence, required force will be F = m a = 20 × 1 4 =   5   N